Flojet 20799 1.1 Gal. Water Pressure Accumulator Tank


  • 1.1 gallon accumulator tank
  • Reduces pump cycling and water pressure fluctuations
  • Maximum 100psi working pressure
  • Default pressure: ~20psi
  • Can be adjusted to fine-tune performance


The Flojet / Jabsco 20799-000A Accumulator Tank has a 1.1 gallon capacity, with a working water volume of about a half gallon. Will smooth flow from faucets, reducing pump cycling and eliminate pulsations and water hammer.

Can be mounted vertical or horizontal, with a 1/4in. male NPT port for water connection. Max 100 psi working pressure. ~6″ Diameter, ~11″ high.

NSF listed for all water applications. Meets RVIA regulations.

Accumulator tanks hold a reservoir of air and water down stream from the pump. The air acts as a cushion, absorbing pump and pressure fluctuations, smoothing the flow and making the system quieter. Accumulators allow the pump to reach shut-off pressure more smoothly which reduces the on/off cycle which gives better control of hot water delivery (do not run hot water through tank).

Flojet accumulator tanks all have a bladder that separates water from air. The bladder is pre-pressurized (~20 psi) but may need fine tuning when installed to give the most efficient performance.

One of the advantages of an accumulator tank is that they can dispense up to half of their capacity of water even when the pump is switched off. So the bigger the reservoir, the more water you have available without having to switch the pump on, helping you wash your hands or clean your teeth without noise.

Stock replacement accumulator tank for Flojet 2840 and 2880 series high volume water pressure system pumps.

Typically not needed with VSD & certain other pumps.

20799000A; 20799-000, Xylem

Additional information

Weight4.5 lbs