SEAFLO SFAT-100-125-01 1L Accumulator Tank 125PSI 1/2in MNPT

Smoother flow and reduced pump cycling

The SEAFLO SFAT-100-125-01 is a 1.0-litre pressurised accumulator tank for demand-pump water systems on boats, yachts, motorhomes, caravans and cabins. Its internal air cushion absorbs pressure fluctuations, reducing rapid pump cycling and helping provide a steadier, quieter flow.

It is installed downstream of a compatible pressure pump. The tank does not pump water and does not increase the pump's maximum flow or pressure.

System benefits

• Stores a small pressurised reserve to smooth short water demands.
• Reduces rapid on/off cycling, helping lower noise, battery drain and pump wear.
• Can improve control of mixed hot and cold water by reducing pressure fluctuations.
• Internal rubber membrane separates the air cushion from the water.
• Automotive-style air valve allows pre-charge inspection and adjustment.
• Can be added to many new or existing pressure-water systems where ratings and connections match.
• Universal mounting capability within the manufacturer's installation limits.

Technical specification

Compatibility and setup checks

• Compatible with marine and mobile pressure-water systems only when pump pressure and all plumbing remain below the 125 PSI maximum.
• Confirm the 1/2 in MNPT connection and allow space for the tank, adapters and service access.
• Set the pre-charge with the water system depressurised. Match it to the pump's cut-in pressure according to the pump/tank instructions; 10 PSI is the factory value, not automatically correct for every system.
• Use potable-water-rated adapters and sealant where the system carries drinking water.
• Mount securely so vibration and vehicle or vessel movement cannot load the plumbing connection.
• Do not use as a compressed-air receiver, fuel vessel, expansion vessel for unsuitable hot-water systems or above its pressure rating.
• Package: one 1 L accumulator tank. Pump, hose, adapters, gauge and mounting hardware are separate unless pictured.

Frequently asked questions

Will this tank increase pump flow?

No. It smooths delivery and stores a small pressurised volume; maximum pump flow is unchanged.

Does it need electrical power?

No. It works through the compressed air cushion inside the tank.

Should I leave the pre-charge at 10 PSI?

Not necessarily. Check the pump cut-in pressure and adjust only with the water side fully depressurised.

Can it connect directly to any pump?

Only if pressure, connection thread, system materials and available mounting space are compatible.