1/2" - 3/4" Tri Clover Cap. Having several extra tri clover caps around is always a good idea. They are usually put in place over the open end of a valve to keep it sanitary. They can also be drilled and welded to make other fittings. 1/2" & 3/4" Tri Clover fittings share the same flange size. These are made from 304 stainless steel