ANKA Air Vacuum Break Valves will allow air into pipe lines to prevent pipes from sucking flat. Once pressure is returned to system the valve will shut off. Manufactured of glass fibre reinforced nylon body with BSPT threads, includes acetyl plunger, nitrile rubber seat and O-ring, and polypropylene air cap. Sizes available in 25mm (1”) only. This size will suit a wide range of pipe sizes. Maximum Working Pressure is 16 bar (1600 psi - 230 psi) @ 20°C.