Preinflated to 10 psi (0.7 bar) in the factory; compatible with RVs, caravans, boat pressurized water systems, food and beverage filling and liquid delivery, and other pressurized systems to help reduce frequent pump starts. Suitable for RVs, boats, travel trailers, caravans, and yachts; provides convenient support for outdoor trips. Easy to install: read the instructions before use; adjust the air pressure in the water tank to be lower than the pump switch pressure, 3 psi (0.2 bar). The connection port uses a threaded connector nozzle; connect the wing nut fittings to the energy storage end of the accumulator tank; the hose is fixed by the clamp; connect the accumulator tank and the pump. Extends pump life: stores water pressure in the pipe during peak periods, buffers the impact of water pressure on the pump, reduces noise and frequent pump starts, and provides a more stable water supply. Practical use scenarios: on an RV or caravan for steadier water pressure and quieter operation; on boats or yachts to smooth water flow during varying loads; for food and beverage filling lines or liquid delivery where stable pressure is required.