Haws Corp. has introduced Model 6519FR, a freeze-resistant valve designed for outdoor drinking fountains. Model 6519FR is designed to eliminate freezing standpipes above the frost line. It is equipped with a gravity/pressure activated piston. When the faucet is off, the piston drops down by gravity, allowing water in the standpipe to drain into a below-frost-line sump chamber. When the valve is activated, pressure in the line closes a pressure valve and advances the piston into the sump chamber, which in turn expels water previously collected through a discharge conduit, and allows normal flow through the standpipe to the bubbler.