Jabsco Par Max 3 24V 40PSI Freshwater Pump
Product Code: CL31395-4024-3A
Jabsco 31395-4024-3A Par Max 3 24V 40PSI freshwater pressure pump is the direct replacement for the now obsolete Par Max 2.9 24V 40PSI (31395-0394). This model is fitted with a built-in pulsation dampening by-pass to control unwanted cycling and noise. The water system now comes complete with quick connect fittings and inline strainer.
Jabsco Par Max 3 24V 40 PSI Features
- Enclosed motor
- Integrate pressure swithc
- Vibration and Noise Reducing Mounting
- Self-priming
- Can run dry without damage
Jabsco Par Max 31394-4024-3A Specifications
- Connections: for 13mm (½”) bore hose
- Dimensions: 230mm long, 152mm wide, 110mm high
- Fuse Size: 10(amp)
- Maximum Current: 4.4(amps)
- Output: 11 litres/minute (2.4 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 2 or more outlets
- Multi-diaphragm design self primes to 1.8m vertical lift, can run dry without damage
- Supplied with snap-in ports for hose 1/2" (13mm) and Strainer
- Quiet running
- Motor protected by automatic thermal overload cut-out
- Includes bypass feature to provide smooth, quiet flow.
- Packaged Dimensions: L:17.00 x H:11.00 x W:34.00cm
- Actual Weight: 1.80 Kg (Approx. 2.30 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 worth more here than on the HD4 - see the right-hand list.
- ✓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.
- ✓A firm shower at 40 PSIThe highest cut-out pressure in the Par-Max 3 range, and the one to have if the shower sits at the end of a long pipe run or there is a filter in the line.
- ✓Only 3 A on 24 voltsAgainst 6 A for the same pump on 12 V - the lowest current draw of any pump we stock. Light cable and a 5 A fuse.
- ✓It primes from 10 ft3 m of dry lift, further than the much larger HD4 manages. If the pump has to sit well above the tank, that matters more than flow rate.
- ✓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.
- ✓ISO 8846 ignition protectedApproved for installation in a compartment where petrol vapour can collect. CE and RCM as well.
- ✓1.5 kg, same body as the Par-Max 2More flow and more pressure for no extra weight or space.
Not supported
- ✗24 volts onlyThis will not run on a 12 V system. The same pump in 12 V is 31395-4012-3A - check the boat before you order.
- ✗No diaphragm kit is offeredJabsco's own service parts list says Not offered against the diaphragm and drive assembly. You can replace the pressure switch, the check valves and the feet, but a perished diaphragm means a new pump. The HD4 is the only family with a published rebuild kit.
- ✗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.
- ✗Noisier than the 25 PSIHigher pressure means the pump works harder and cycles more noticeably, particularly without an accumulator tank. On older plumbing the 25 PSI version is the kinder choice.
- ✗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.
- ✗No fuse in the boxA 5 A fuse is specified for this model and is not supplied.
- ✗Three chambers, not fourThe HD4 has four, which gives a steadier flow with less pulsing at the tap.
What you get
The firmest of the small pumps
40 PSI is the highest cut-out in the Par-Max 3 range. If the shower is the reason you are buying a pump, this is the one.
3 A, the lightest load we stock
Against 6 A for the same pump on 12 V. Light cable, a 5 A fuse, and very little voltage drop over a long run.
Primes from 10 ft
Further than the HD4, which manages 8. Measure the vertical rise from the bottom of the tank to the pump before you choose.
Small and light
1.5 kg on rubber anti-vibration feet, the same body as the Par-Max 2.
Reading a Jabsco part number
Jabsco's part numbers look impenetrable until someone shows you the pattern. Take 31395-4012-3A, the 12 V 40 PSI Par-Max 3 - once you can read it, the whole range makes sense in about ten seconds.
31395 - Par-Max 3
The family. 31295 is the Par-Max 2 at 2 GPM, 31395 the Par-Max 3 at 3 GPM. The heavy-duty HD4 uses a completely different scheme beginning Q4.
-40 - 40 PSI
The first two digits after the dash are the pressure switch cut-out. 25 is 25 PSI, 35 is 35 PSI, 40 is 40 PSI. The Par-Max 2 is 35 PSI only.
12 - 12 volt
The last two digits are the voltage. 12 is 12 V, 24 is 24 V. So 31395-4024-3A is the same pump as this one in 24 V.
-3A - range suffix
Constant across the current Par-Max line, and the quickest way to tell a current pump from an older superseded one.
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 3
Every figure below comes from Jabsco's published datasheet for part 31395-4024-3A.
| Jabsco part number | 31395-4024-3A |
|---|---|
| Open flow rate | 3 GPM (11.3 LPM) |
| Pressure switch cut-off | 40 PSI (2.8 bar) |
| Maximum operating pressure | 40 PSI (2.8 bar) |
| Chambers | 3 chamber diaphragm |
| Nominal voltage | 24 V dc |
| Voltage range | 18 to 27.2 V dc |
| Maximum current draw | 3 A at 40 PSI (2.8 bar) |
| Recommended fuse | 5 A, not supplied |
| Leads | 305 mm, 16 AWG (1.5 mm2) |
| Motor | TENV permanent magnet |
| Duty cycle | Intermittent |
| Self-priming | Up to 10 ft (3 m) dry prime |
| Run dry capable | Yes |
| Ports | 2 x 1/2 in (13 mm) straight hosebarb |
| Strainer | Inline quick connect, 40 mesh |
| Weight | 3.2 lb (1.5 kg) |
| Fluid temperature | 32 to 140 F (0 to 60 C) |
| Ingress protection | IPX6 |
| Upper and lower housing | Fibre reinforced polypropylene |
| Diaphragm | Santoprene |
| Check valves and seals | EPDM |
| Approvals | CE, RCM, ISO 8846 ignition protected |
| Warranty | 3 years |
| Diaphragm / drive assembly | Not offered |
| Pressure switch kit | 18916-1040 |
| Check valve assembly | 20407034 |
| Baseplate / mounting feet | 20717001A |
| 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 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. Every column links to that model's own Jabsco datasheet.
| 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 |
|---|---|---|---|---|---|---|
| You are viewing | ||||||
| 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 | £101.54 £117.35 | £119 £135.88 | £100.71 £123.53 | £111.90 | £97.20 £123.53 | £116.88 |
| Manufacturer datasheet | ||||||
| View product | Par-Max 2 | Par-Max 2 | Par-Max 3 | Par-Max 3 | Par-Max 3 | You are here |
Par-Max HD4
The heavy-duty four-chamber pumps, for a bigger boat or one where the pump has to work. Cast aluminium pump head and a published rebuild kit - but they prime from 8 ft where these prime from 10.
| 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 |
|---|---|---|---|---|
| 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 | £129.90 | £129.90 | £220 | £220 |
| Manufacturer datasheet | ||||
| View product | Par-Max HD4 | Par-Max HD4 | Par-Max HD4 | Par-Max HD4 |
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 3 pump, 31395-4024-3A
- 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
- Rubber anti-vibration mounting feet
- 305 mm 16 AWG (1.5 mm2) power leads
You may also need
Jabsco Par-Max FAQs
Will this run on 12 volts?
Can I rebuild it, or is it a throwaway?
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 these?
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 bigger one is worth it.
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