The Kingston Brass Flood Protect Check Valve is a safety component installed to help automatically stop the water moving to the faucet in the case of a sudden increase of water flow. To help prevent flooding and damage to the bathroom, this adapter will shut off when water flow increases to 3.0 GPM/11.3 LPM. It includes 1/2��_��__ male threading on one end and 1/2��_��__ female threading on the other end. Constructed in solid brass, the valve will insure many years of exceptional performance. Normally, the part is placed between the supply line and shank to the faucet.