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