Full flow check valve design Threaded union allows pump to be removed without disrupting discharge piping Saves time and money - easy to install Neoprene gasket and flapper, weighted with stainless steel backing plates and stainless steel rivet Can be installed on vertical or horizontal pipe Meets plumbing codes requiring a ball valve installed in conjunction with a check valve All stainless steel screws Replaceable flapper in the check valve Extra wide hinge to reduce stress