Pump - ParMax HD5 Freshwater 12v J20-280

Installed to provide on‐demand flow and pressure of freshwater to galleys, showers, washing machines, etc. These pumps are equipped with a bypass which enables smoother flow and decreases cycling, and provide similar pressure to that in a home on land.

These HD (Heavy Duty) models include a wider diameter motor with a powder coated shell, cast aluminum endbells and lower housing to improve pressure capability and life. With an open flow rate of 5 GPM (18.9 LPM) and choice of either 40PSI (2.8 bar) or 60 PSI (4.1 bar), these pumps deliver exceptional performance. Standard models provide good performance in an economical footprint.

Jabsco’s updated and improved lineup of freshwater supply pumps are designed to provide years of satisfactory service in applications both large and small. 

Kit includes: 

  • 1 x Par-Max HD5 Freshwater Pump
  • 2 x 1/2" (13mm) straight hosebarbs
  • 2 x 3/4" (19mm) straight hosebarbs
  • 1 x 90° 40 mesh quick connect strainer


  • Typical rule of thumb for sizing is 1 GPM per outlet
  • Co-molded diaphragm technology for long life and durability
  • Heavy duty motors and cast aluminum lower housings which allow for longlife, even at high pressures
  • Efficient and quiet operation
  • Integrated, sealed pressure switch for on-demand operation
  • Self-priming allows for installation versatility
  • Can run dry without damage
  • Quick connect ports for ease of installation, servicing, and maintenance
  • Vibration dampening mounting feet
  • Equipped with integrated bypass module to reduce cycling and provide smoother flow


JPW SKU J20-278 J20-280
Jabsco Part No. P501J-115S-3A P501J-118S-3A
Replaces Old Versions -
Voltage 12V 12V
Open Flow 5 GPM
(18.9 LPM)
(18.9 LPM)
Shut-off Pressue 40 PSI
(2.8 BAR)
60 PSI
(4.1 BAR)
Max Amp Draw 12A 13A
Recommended Fuse Size 20A 20A


Motor Design Brushed, permanent magnet TENV
Pumphead upper housing material Fiber reinforced polypropylene
Diaphragm Santoprene
Check Valves EPDM
Max Inlet Pressure 30 PSI (2.1 Bar)
Fluid Temp Range 32°F – 140°F (0°C – 60°C)
Dry Self-priming Capability 8ft min (2.4m min)
Certifications CE, ISO8846, RCM
Water Ingress protection IPX6
Warranty 3 years

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