Surejust Accumulator Tank & Fittings 8 Litre. The accumulator helps end annoying water surge. They come pre-pressurized with a built-in diaphragm (instead of just an air pocket at top of tank) that cushions surges to assure a smooth flow.Connects to main water distribution line or after pump in demand system. Works with pressures up to 112 PSI. Sturdy St/steel flange and thread that holds the diaphragm in place. The potable water only ever comes into contact with the st/steel or butyl diaphragm. Easy installation as the unit comes ready to connect onto a 15mm plastic plumbing. Mounts in any position. Mounting bracket and St/steel strap included. Pre-charged pressure is 19 psi