This plastic tap nipple is suitable for an outdoor faucet with an external thread and a diameter of 1/2”inch. tap nipples come in different sizes, therefore before buying a nipple it is better to measure the thread of the faucet. Here, 21mm is 1/2" inch, 26.5mm is 3/4" inch and 33.3mm is 1”inch. in addition, check whether the outdoor faucet has an internal or external thread. for an outdoor faucet with internal thread, use an external nipple and for an outdoor faucet with external thread, use an internal nipple.
