CONNECTION SIZEFaucet diverter has 55/64-27 internal thread, and an external thread adapter 55/64-27 external thread (bottom) and 15/16-27 external thread (top) are included, The thread of the connecting hose is G1/2 PRODUCT COMPATIBILITY - Connects to any sink with removable aerator. It is not compatible with pull out faucets, pump faucets, bathtub spout or shower pipe. As well, not compatible with garden hose. (DOES NOT Fit NPT1/2'' NOT fit to Garden hose). PLEASE NOTE this Faucet outlet switch valve DO NOT FIT TO GARGEN HOSE , NOT FOR laundry sink faucet . thanks . APPLICATONS: the thread connects to hose is G1/2(1/2 IPS)which is standard for hand bidet sprayer hose,shower hose, (DOES NOT Fit NPT1/2'' NOT fit to Garden hose). 1/4-turn valve operation means only a quarter turn of the handle Smoothly Lever Handle: Diverting the water from the sink's faucet to the attached hose that fits standard G1/2" inch threads by turning the diverter valve up or down This heavy-duty diverter with a clean look is solidly made of brass with hard plastic handle for durability and longevity, nice sleek chrome finish made to withstand daily rust. Compact design nicely matches the fixtures.