This fitting is compatible with several of our 100 series water pumps. WP337, WP362, WP431 and WP432 are examples of a few pump numbers where this fitting could be used. One end is #16AN o-ring boss configuration and the other end is #16 Wiggins / Clamshell quick disconnect. The increased length of this fitting can help when you need to run two swept hose ends next to each other.