The 1.5" Tri Clamp Cap has a 1/2" cut out and is compatible with all tri-clamp and tri-clover fittings. Caps are usually placed over the open end of valves or tri clamp compatible piping in order to keep it sanitary. This cap has a 1/2" hole in the center that offer a blank slate onto which another sanitary fitting can be welded. These cutouts can be helpful when transitioning from Tri-Clamp to welded fitting or your own imaginative purpose. Tri clover caps can also be drilled and welded to make other fittings. Having several extra tri clover caps around is always a good idea. These end caps are manufactured from 304 food grade stainless steel.