The Hozelock Pressure Reducer reduces the water pressure to 20 psi 15 bar which ensures that micro irrigation systems are not over-pressurised and that performance is optimised There is an internal filter to prevent dirty water affecting dripper performance The Pressure Reducer has an integral filter to prevent dirty water affecting dripper performance The inlet is 34in BSP and this screws directly onto a water computer or most outside taps Supplied with two outlet adaptors 4mm and 13mm It is ideal for use with 4mm and 13mm hose – 4mm for small micro irrigation systems of up to 15 drippers and 13mm hose for larger systems