Flojet mini accumulator tank creates the smoothest water flow and reduces on/off switch cycling of pump by controlling the variation in pressure and flow between the pump and faucet in water systems. Rated 0.65 liter - (21.5 fl oz). Has internal pressurized bladder. Water PSI max is 125. Has standard air pressure nozzle valve which should be filled with air to 2 PSI above pump auto PSI switch rating. Brand new - has 3/4" diameter female quick connect ports. Tank does not include fittings. Size - 9" long x 4.6" New - Retails for $50.00 each.