Jabsco Par Max HD4 12V 40PSI Water Pressure Pump
Product Code: CLQ401J-115S-3A
- Connections: for 13mm (½”) bore hose
- Dimensions: 239mm long, 109mm wide, 97mm high
- Fuse Size: 15(amp)
- Output: 15 litres/minute (3.5 gallons/minute) open flow
- PRESSURE SWITCH - cuts in at 1.4bar (20psi) - cuts out at 2.8bar (40psi)
- Efficient, high-flow, self-priming pump serving 4 or more outlets
- Multi-diaphragm design self primes to 1.5m vertical lift, can run dry without damage
- Supplied with snap-in ports for hose 1/2" (13mm) and Strainer
- Motor protected by automatic thermal overload cut-out
- Packaged Dimensions: L:40.00 x H:14.00 x W:15.00cm
- Actual Weight: 2.50 Kg (Approx. 3.00 Kg packed)
What this pump does - and what it does not
Everything below is from Jabsco's own datasheet, linked at the foot of this page. What the pump will not do is set out just as plainly as what it will.
Included
- ✓Three-year Jabsco warrantyBacked by the manufacturer, and a fair reflection of a pump built around a cast aluminium head and a published set of service parts.
- ✓Runs dry without damageJabsco states Run-Dry Capable: Yes. Empty the tank without noticing and the pump survives it - the commonest way a cheaper pump dies.
- ✓Four-chamber diaphragmAgainst three on the Par-Max 2 and 3. Smoother flow and less pulsing at the tap.
- ✓Cast aluminium lower housingA cast aluminium pump head and a cast aluminium and coated steel motor casing. The Par-Max 2 and 3 use polypropylene.
- ✓ISO 8846 ignition protectedApproved for installation in a compartment where petrol vapour can collect. CE and RCM as well.
- ✓The 40-mesh strainer is in the boxAlong with both port fittings. Jabsco calls a strainer required in all applications, so it is the one part you should not have to go looking for.
- ✓You can rebuild itDiaphragm and drive assembly 18753-0730, check valve assembly 18753-0731, baseplate 18753-0729, pressure switch kit 16470-0040.
- ✓Internal bypassLets the pump throttle down at a part-open tap instead of hammering on and off.
- ✓IPX6, and 0 to 60 C fluid and ambientRated against powerful jets of water from any direction.
Not supported
- ✗It primes less than the smaller pumps8 ft (2.4 m) dry prime against 10 ft (3 m) on the Par-Max 2 and 3. Counter-intuitive, and it catches people out on a deep tank. Measure the lift before you choose.
- ✗Intermittent duty onlyEvery Par-Max is rated for intermittent duty, not continuous running. They are built for a domestic water system, where the pump runs while a tap is open. For continuous transfer or circulation you need a pump built for it.
- ✗Maximum inlet pressure is 30 PSIFine on a gravity or tank feed. If the boat takes a shore water connection, fit a pressure regulator upstream - marina pressure can sit well above that.
- ✗No fuse in the boxA 15 A fuse is specified for this model and is not supplied. The 24 V HD4 models take 10 A.
- ✗Parts do not swap with a Par-Max 2 or 3Different check valve, baseplate and pressure switch. The only part shared across the whole range is the port clip set, 30647-1000.
What you get
Four chambers, not three
More chambers means smaller pressure pulses, so the flow at the tap is steadier and the pump cycles less. It is the clearest difference between the HD4 and the rest of the range.
Built to be serviced
Diaphragm and drive assembly 18753-0730, check valve 18753-0731, baseplate 18753-0729, pressure switch 16470-0040. On most of the smaller Par-Max pumps Jabsco lists the diaphragm kit as Not offered.
Dry running is designed in
Jabsco publishes Run-Dry Capable: Yes for every pump in the Par-Max range. Run the tank out and you have not killed the pump - which is exactly what happens on a Friday night.
Ignition protected
ISO 8846 approved, so it may go in a compartment where petrol vapour can collect. Cast aluminium and coated steel motor casing, IPX6, CE and RCM.
Reading a Jabsco part number
Jabsco's part numbers look impenetrable until someone shows you the pattern. Take Q401J-115S-3A, the 12 V 40 PSI HD4 - once you can read it, the whole range makes sense in about ten seconds.
Q4 - Par-Max HD4
The first two characters are the pump size. Q3 is the HD3 at 3 GPM, Q4 the HD4 at 4 GPM, P5 and P6 the larger HD5 and HD6.
01J - 12 volt
The voltage sits here. Q401J is 12 V; Q402J is the same pump in 24 V.
-115S - 40 PSI
112S is 25 PSI, 115S is 40 PSI, 118S is 60 PSI. We stock the 25 and 40 PSI versions.
-3A - range suffix
Constant across the current Par-Max line. The smaller pumps use a different scheme entirely: 31395-4012-3A is family 31395, then 40 PSI, then 12 V.
How big a pump do you actually need?
Jabsco publishes one sizing rule and it is refreshingly simple. Everything else is about how hard the pump has to work, how far it has to lift, and whether you can repair it.
Par-Max 2
A galley tap and a basin. Three chambers, polypropylene housings, 1.5 kg. The lightest and simplest pump in the range, and it primes from 10 ft.
Par-Max 3
Galley, heads and a shower. Same body, weight and 10 ft prime as the Par-Max 2, with a higher flow rating and a choice of cut-out pressure.
Par-Max HD4
A bigger boat, or one where the pump has to work. Four chambers, cast aluminium pump head, 2.5 kg - and the only family with a published rebuild kit. Primes from 8 ft, not 10.
The sizing rule
Jabsco's stated guideline is 1 GPM per outlet. Count your taps, including the shower and any deck wash, and buy that many gallons per minute. Then check the lift from tank to pump against the prime figure.
Par-Max HD4
Every figure below comes from Jabsco's published datasheet for part Q401J-115S-3A.
| Jabsco part number | Q401J-115S-3A |
|---|---|
| Replaces | 31600-0092, 31620-0092, 82400-0092 |
| Open flow rate | 4 GPM (15.1 LPM) |
| Pressure switch cut-off | 40 PSI (2.8 bar) |
| Maximum operating pressure | 40 PSI (2.8 bar) |
| Maximum inlet pressure | 30 PSI (2.1 bar) |
| Chambers | 4 chamber diaphragm |
| Nominal voltage | 12 V dc |
| Voltage range | 9 to 13.6 V dc |
| Maximum current draw | 10 A at 40 PSI (2.8 bar) |
| Recommended fuse | 15 A, not supplied |
| Leads | 305 mm, 14 AWG (2.5 mm2) |
| Motor | TENV permanent magnet |
| Duty cycle | Intermittent |
| Self-priming | Up to 8 ft (2.4 m) dry prime |
| Run dry capable | Yes |
| Internal bypass | Yes |
| Ports | 2 x 1/2 in (13 mm) straight hosebarb |
| Strainer | Inline quick connect, 40 mesh |
| Weight | 5.6 lb (2.5 kg) |
| Fluid temperature | 32 to 140 F (0 to 60 C) |
| Ambient temperature | 32 to 140 F (0 to 60 C) |
| Ingress protection | IPX6 |
| Upper housing | Polypropylene |
| Lower housing | Cast aluminium |
| Motor casing | Cast aluminium, coated steel |
| Baseplate | Nylon with rubber feet |
| Diaphragm | Santoprene |
| Check valves and seals | EPDM |
| Fasteners | Stainless steel |
| Approvals | CE, RCM, ISO 8846 ignition protected |
| Warranty | 3 years |
| Diaphragm / drive assembly | 18753-0730 |
| Check valve assembly | 18753-0731 |
| Pressure switch kit | 16470-0040 |
| Baseplate / mounting feet | 18753-0729 |
| Port clips | 30647-1000 |
Fitting it
- Fit the supplied inline 40-mesh strainer between tank and pump inlet, somewhere you can reach to clean it. Jabsco lists this as required in all applications.
- Use 1/2 in (13 mm) internal diameter flexible hose to keep vibration out of the plumbing.
- Do not overtighten the mounting screws - the rubber feet need to be free to absorb vibration.
- Fuse the supply at the rating in the specification table above. No fuse is supplied with any pump in the range.
- Maximum inlet pressure is 30 PSI, so if the boat takes a shore water connection, fit a pressure regulator upstream.
Ask us before you order
- If it has to fit a known space. Jabsco publishes carton dimensions only. Call us and we will measure one off the shelf for you.
- Certified potable water. If your survey, insurer or charter code requires it, we will find you a pump that carries the certificate.
Par-Max HD4
The heavy-duty four-chamber pumps. Cast aluminium pump head, a published rebuild kit, and 4 GPM in every version - you are choosing voltage and cut-out pressure only. Every column links to that model's own Jabsco datasheet.
| Model | Par-Max HD4 12 V, 25 PSI | Par-Max HD4 12 V, 40 PSI | Par-Max HD4 24 V, 25 PSI | Par-Max HD4 24 V, 40 PSI |
|---|---|---|---|---|
| You are viewing | ||||
| Jabsco part | Q401J-112S-3A | Q401J-115S-3A | Q402J-112S-3A | Q402J-115S-3A |
| Open flow | 4 GPM (15.1 LPM) | 4 GPM (15.1 LPM) | 4 GPM (15.1 LPM) | 4 GPM (15.1 LPM) |
| Cut-out pressure | 25 PSI | 40 PSI | 25 PSI | 40 PSI |
| Max operating pressure | 30 PSI | 40 PSI | 30 PSI | 40 PSI |
| Chambers | 4 | 4 | 4 | 4 |
| Dry prime | 8 ft (2.4 m) | 8 ft (2.4 m) | 8 ft (2.4 m) | 8 ft (2.4 m) |
| Run dry capable | Yes | Yes | Yes | Yes |
| Max current draw | 8 A | 10 A | 4 A | 5 A |
| Fuse | 15 A | 15 A | 10 A | 10 A |
| Weight | 2.5 kg | 2.5 kg | 2.5 kg | 2.5 kg |
| Lower housing | Cast aluminium | Cast aluminium | Cast aluminium | Cast aluminium |
| Ingress rating | IPX6 | IPX6 | IPX6 | IPX6 |
| ISO 8846 ignition protected | Yes | Yes | Yes | Yes |
| Diaphragm kit | 18753-0730 | 18753-0730 | 18753-0730 | 18753-0730 |
| Pressure switch kit | 16470-0025 | 16470-0040 | 16470-0025 | 16470-0040 |
| Price | £108.25 | £108.25 | £183.33 | £183.33 |
| Manufacturer datasheet | ||||
| View product | Par-Max HD4 | You are here | Par-Max HD4 | Par-Max HD4 |
Par-Max 2 and Par-Max 3
The six lighter pumps. Same body, same 10 ft prime, same 1.5 kg - they differ in flow, cut-out pressure and voltage. Worth a look if the pump sits high above the tank, because these prime from 10 ft where the HD4 manages 8.
| Model | Par-Max 2 12 V, 35 PSI | Par-Max 2 24 V, 35 PSI | Par-Max 3 12 V, 25 PSI | Par-Max 3 24 V, 25 PSI | Par-Max 3 12 V, 40 PSI | Par-Max 3 24 V, 40 PSI |
|---|---|---|---|---|---|---|
| Jabsco part | 31295-3512-3A | 31295-3524-3A | 31395-2512-3A | 31395-2524-3A | 31395-4012-3A | 31395-4024-3A |
| Open flow | 2 GPM (7.6 LPM) | 2 GPM (7.6 LPM) | 3 GPM (11.3 LPM) | 3 GPM (11.3 LPM) | 3 GPM (11.3 LPM) | 3 GPM (11.3 LPM) |
| Cut-out pressure | 35 PSI | 35 PSI | 25 PSI | 25 PSI | 40 PSI | 40 PSI |
| Max operating pressure | 25 PSI | 25 PSI | 25 PSI | 25 PSI | 40 PSI | 40 PSI |
| Chambers | 3 | 3 | 3 | 3 | 3 | 3 |
| Dry prime | 10 ft (3 m) | 10 ft (3 m) | 10 ft (3 m) | 10 ft (3 m) | 10 ft (3 m) | 10 ft (3 m) |
| Run dry capable | Yes | Yes | Yes | Yes | Yes | Yes |
| Max current draw | 6 A | 3 A | 5 A | 3 A | 6 A | 3 A |
| Fuse | 10 A | 5 A | 10 A | 5 A | 10 A | 5 A |
| Weight | 1.5 kg | 1.5 kg | 1.5 kg | 1.5 kg | 1.5 kg | 1.5 kg |
| Ingress rating | IPX6 | IPX6 | IPX6 | IPX6 | IPX6 | IPX6 |
| ISO 8846 ignition protected | Yes | Yes | Yes | Yes | Yes | Yes |
| Diaphragm kit | Not offered | Not offered | Not offered | Not offered | Not published | Not offered |
| Pressure switch kit | 18916-1035 | 18916-1035 | 18916-1025 | 18916-1025 | 18916-1040 | 18916-1040 |
| Price | £84.62 £97.79 | £99.17 £113.23 | £83.93 £102.94 | £93.25 | £81 £102.94 | £97.40 |
| Manufacturer datasheet | ||||||
| View product | Par-Max 2 | Par-Max 2 | Par-Max 3 | Par-Max 3 | Par-Max 3 | Par-Max 3 |
Choosing a Par-Max
Three questions settle it in most cases, and none of them is about the pump itself.
How many outlets?
Jabsco's guideline is 1 GPM per outlet. A galley tap and a heads basin is two, so a Par-Max 2 covers it. Add a shower and you want 3 GPM. A second heads, a galley, a shower and a deck wash is four, and that is the HD4.
Counting generously is the safer error - an oversized pump cycles less and lasts longer.
How far above the tank?
This is the one people forget. The Par-Max 2 and 3 self-prime from 10 ft; the bigger HD4 manages 8 ft. If the pump sits well above the tank - a deep bilge tank on a motor yacht, say - the smaller pump may actually be the one that primes.
Measure the vertical rise from the bottom of the tank to the pump before you choose.
25 or 40 PSI?
40 PSI gives a firmer shower and copes better with a long run of pipe or a filter in the line. 25 PSI is gentler on older plumbing and quieter, and it draws less current.
If the boat has an accumulator tank, either works well; without one, the higher pressure pumps cycle more noticeably.
What arrives, and what you will still need
Supplied
- Par-Max HD4 pump, Q401J-115S-3A
- Pressure switch, factory set to 40 PSI
- Inline 40-mesh quick-connect strainer
- 2 x 1/2 in (13 mm) straight hosebarb port fittings
- Quick-connect port clips
- Nylon baseplate with rubber mounting feet
- 305 mm 14 AWG (2.5 mm2) power leads
You may also need
Jabsco Par-Max FAQs
Can I rebuild it, or is it a throwaway?
Should I have the 25 PSI or the 40 PSI?
Where do the numbers on this page come from?
What about drinking water?
Is a strainer included?
Can I run it continuously?
What happens if the tank runs dry?
Can it go in the engine compartment?
Why does the bigger HD4 prime less than the smaller pumps?
How long is the warranty?
Which fuse do I need?
Not sure which one?
Tell us how many outlets you have and how far the pump sits above the tank, and we will tell you which Par-Max to buy - including when the smaller one is the right answer.
Talk to the chandlery
Only 2 left
Only 2 left
Only 2 left
Only 1 left
Only 2 leftDelivery & Returns
We ship chandlery, clothing and marine equipment around the world and always endeavour to get your products to you as quickly and as cost-effectively as possible. We will dispatch your order as soon as possible, usually the day it is received for orders placed before 2PM. Our stock is controlled such that all items bought online are available in stock with our shop or supplier. If there is any delay due to a product being out of stock, or there is a longer lead time, for example, in the case of ‘Special Order’ items, or having a longer lead time for production, we will contact you, however, this will also be suggested at the checkout. In such cases, we will advise when the product will be delivered (or is available for collection if you have opted to collect from our store).
Standard UK Mainland 1 - 2 Working Days (Excluding Weekends & Bank Hollidays) - £6.95
Next Day Delivery (Please note that orders must be received by 1400hrs for next day delivery. In some instances, we may be able to dispatch later in the day for next day delivery but this cannot be guaranteed. - £9.95
Scotish Highlands & Islands 2 - 3 Working Days (Excluding Weekends & Bank Hollidays) - 14.45
Isle of Wight 2 - 3 Working Days (Excluding Weekends & Bank Holidays) - £9.45
Northern Ireland 2 - 3 Working Days (Excluding Weekends & Bank Holidays) - £14.95
Our policy is simple – you have up to 90 days to return your purchase if it’s not suitable or you’ve changed your mind. Our hassle-free 90-day returns policy applies to most items and is offered in addition to your statutory rights.
Return goods purchased in-store
Simply bring your order confirmation or delivery note and the item you wish to return or exchange, unused and in its original packaging, to our till point in the shop. If you paid by debit or credit card, please ensure you also bring the payment card you originally used to buy the item/s.
Return goods bought online
1. Start your return through the Returns Process in your Fox’s Chandlery online customer account within 90 days of delivery.
2. Once approved, you will receive a Return Authorisation Number (RAN) and shipping instructions.
3. Package the item securely in its original packaging – please do not apply labels or tape directly to the product packaging.
4. Use a tracked courier service and always obtain proof of postage.
5. Please allow up to 14 working days after we receive the goods for your return to be processed.
If you need your item/s to be collected because it's large or heavy please call our online team on +44 (0) 1473 694725.
If you need to add or remove items from your order, change the details of your delivery address or cancel the order completely, please contact our Online Team for advice on +44 (0) 1473 694725 between 0900 and 1730 Monday to Friday or email us. Please quote your order number and order date. If your order has already been dispatched or delivered, then you will need to follow our Returns procedure in the event of any unwanted products.