Our 1-1/2'' Combo Check includes a check valve and a union in one fitting. This combination makes it easy to install, eliminating the need to glue the two components together in the field. So, you don't have to worry about the valve becoming a restriction in the discharge line when paired with one of our sewage pumps. The solvent-weld ends make the Combo Check easy to install. It will connect to SCH40 PVC.The Combo Check's threaded union makes it easy to remove a pump when necessary. There is no need to cut the discharge pipe to do so. This is a useful feature when performing routine maintenance.Designed for full flow operation with a clog-resistant design, the 1-1/2'' Combo Check can be installed in a vertical or horizontal orientation. This unit has the two key elements needed for a long lasting and serviceable setup. The Combo Check is the right combination for most sewage applications.