You can also Pressurise the supply in loft conversions, where outlets are higher than the water source. Suitable for positive head applications.It does not require a gravity flow to start. Body and impeller are both constructed from durable and long-lasting brass. 4 flexible hoses - for easy installation. Supplied with 4 22mm anti-vibration flexible hoses with integral isolating valves. Maximum head (closed valve): 2 bar. Dimensions: 295mm High x 130mm Wide x 220mm Deep approx. ANY QUESTIONS FEEL FREE TO ASK.