Backflow Device Winterization

Water expands when it freezes, and a backflow assembly full of standing water is one of the first casualties of a cold snap. A single hard freeze can crack a bronze body, split a bonnet, or distort check seats — damage that usually means full replacement rather than repair, plus an emergency install in the middle of winter. Irrigation assemblies are the most common victims because they sit outdoors and idle all winter, but any exposed device is at risk. Winterization is the seasonal routine that empties the device before the cold arrives.

Through FlowFast Plumbing, an independent local plumber shuts off the water supply to the assembly, opens test cocks and drains to empty the device and adjacent piping, and leaves valves in the correct half-open position so any residual moisture has room to expand. Where your climate demands it, the pro adds insulation, a thermal blanket, or recommends an enclosure or heat source. In spring, the same visit pattern reverses: the device is slowly repressurized, checked for leaks, and returned to service — often paired with the annual test for irrigation systems.