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 .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 2PSI above pump auto PSI switch rating. Brand new - has 3/4" diameter female quick connect ports. Tank does not include fittings. Size - 9"L x 4.6" New - Retails for $50.00 each.