This 1 1/2 IN anti-siphon vacuum breaker hot or cold water repair kit for series 188, 288, 388, prevents the reverse flow of polluted water from entering into the potable water supply due to backsiphonage. It consists of a disk and disc float, a bonnet and O-ring. It has a full size orifice to assure pipe size capacity and maximum flow. It is ideal for low flow, non-continuous hot or cold water health hazard installations such as on laboratory equipment. Maximum Pressure is 125psi (8.6 bar).