Schedule 40 PVC Pipe Mipt x Slip Reducing Male Adapter (1-1/4" x 1-1/2" Dia. (1 Pack)) - 436-169 If you want to connect a smooth pipe of one size to a female socket of a different size, you would use a Slip x Mipt Reducing Male Adapter. This fitting has a larger connection one end and has a smaller connection on the other end. All of our Schedule 40 fittings are NSF rated 14 & 61, which means they are certified for use with potable (drinking) water. Maximum temperature is 140 degrees F