Groco, Accumulator Tank

Mfr: Groco
$214.17 to $546.22

$214.17 to $546.22


A Must for Today's High Performance Water Pressure Systems
Accumulator tanks help maintain constant water pressure at the faucet. High pressure air, contained by a rubber bladder in the middle of the tank, continues to maintain water pressure in the line, even when the pump isn't running. The result is smooth delivery of pressurized water, more even temperature mix in showers, and reduced pump cycling - prevents pump from cycling on just to fill a glass of water.
Choose the largest size Pressure Storage Tank which will fit into the available space; larger tanks reduce pump cycling and will prolong motor and pressure switch life. For maximum efficiency and water delivery, the accumulator tank pressure charge should be the same as the pump switch turn-on setting, typically 20 psi.
Size the tank by the output and pressure rating of the pump
For fresh or salt water use. Non-corrosive components are used for all wetted parts
Pressure Storage Tanks may be mounted in any position (including upside-down), and anywhere in the boat's cold water plumbing after the pump
Stainless steel straps and mounting hardware are included for the PST-1 and PST-2; larger tanks have a mounting base
Several small Pressure Storage Tanks may be installed in series if you don't have enough room for a single large one
Drawdown is the amount of water the tank will hold, and is about half the volume of the tank itself


Item #
Drawdown Volume
Pipe Size
Groco, Water Pressure Accumulator Tank, PST-3A
Item #:531625-3gal-15"-19.25"
Drawdown Volume: 3.0 Gallons
Diameter: 15.4"
Length: 19.25"
Mounting: Stand/Feet
Pipe Size: 3/4" NPT
Groco, Water Pressure Accumulator Tank, PST-2
Item #:531625-1.4gal-11"-14in
Drawdown Volume: 1.4 Gallons
Diameter: 11"
Length: 14"
Mounting: Straps
Pipe Size: 3/4" NPT
Groco, Water Pressure Accumulator Tank, PST-1
Item #:531625-.5gal-8"-12.63"
Drawdown Volume: 0.5 Gallons
Diameter: 8.0"
Length: 12.63"
Mounting: Straps
Pipe Size: 3/4" NPT



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GROCO will repair or replace, at its discretion, any part of any of its products which is determined to be defective by the factory or by an authorized GROCO service center within one year of the OEM installation date or the distributors original date of sale.


  • All returns must be recevied within 30 days of receipt of the order.
  • Manufacturer defects reported within 30 days of receipt will be supplied a pre-paid label for return shipping upon approval.
  • Please contact Go2marine LFS Marine and Outdoor for Manufacture Defects, Returns and help with Warranties.