Female Adapter for Schedule 40 PVC Pipe (Slip x Fipt). Female adapters are used to connect 2 parts with 2 different end types, a female adapter has a female (fipt) socket on side and a slip socket on the opposing side. They are used to adapt a cemented or solvent welded connection to a male thread connection. A Slip x Fipt Female Adapter is the most common type of female adapter. It contains a female (fipt) connection 1 end and has a slip socket connection on the other end. So, for example, if you want to connect a 3/4 in. threaded pipe to a 3/4 in. smooth pipe, you would use a 3/4 in. Slip/Fipt Female Adapter. All of our Schedule 40 fittings are NSF rated 14 and 61, which means they are certified for use with potable (drinking) water. Maximum temperature is 140°F. Color: White.