Jabsco 0.65-Liter Mini Accumulator Tank with Bladder

The Jabsco 0.65-Liter Mini Accumulator Tank (part 30573-0003) is the smallest tank in the 30573 family, built for boats where there is almost no room left near the freshwater pump. Inside, a flexible bladder separates a cushion of air from the water, so the tank soaks up pressure spikes and hands back a small reserve each time a tap opens. The shell is a food-grade polymer, which matters because every drop that reaches your galley faucet passes through it.

Even a little stored volume changes how a diaphragm pump behaves. Instead of clicking on and off in short bursts while someone rinses a cup, the pump runs in fewer, longer cycles, which is easier on the pressure switch and the motor brushes. The flow at the tap also stops pulsing, and a water heater mixing valve holds temperature better when pressure is steady.

This mini size is a good match for a small cabin cruiser, a daysailer with a single galley tap, or as an add-on near a pump that already lacks a tank. Check the air precharge with a tire gauge while the system is drained, and set it a few psi under the pump's cut-in pressure. Mount it close to the pump outlet so it can do its job before the water reaches the long hose runs. Larger tanks and service parts are listed in our marine toilets and sanitation systems.

• 0.65-liter capacity, part 30573-0003
• Internal bladder holds a precharged air cushion
• Food-grade polymer body
• Reduces short cycling of pressure-switch pumps