This Nipple is commonly used to couple the filter housing together on water filter systems and many models of reverse osmosis systems. It is also used to attach a threaded shut off valve to some model of reverse osmosis systems. Made of lead-free brass for durability and long life. The dimensions of this nipple are: 1/4″MPT x 1/4″MPT X 1-3/8″ long. Ultima part number BF116.