The 2” 950XLTDABF Double Check Detector Assembly is utilized in low health hazard, fire protection applications for protection against both backsiphonage and backpressure of polluted water into the potable water supply. It features a metered bypass to detect leaks and any unauthorized water use, saving you time and money on potentially costly repairs, and can be installed vertically or horizontally for added versatility. The 975XLTDABFSS is assembled with butterfly shutoff valves and butterfly valve supervisory switches (UL and FM approved for indoor and outdoor use). Its cast bronze body and 300 series stainless steel internals are corrosion-resistant, and it features a maximum working water pressure of 175 psi and water temperature of 180°F.