Description See Detail images for actual dimensions B = 4.0 inch A = 1-1/8 inch Long neck for ease of welding. Fits Clamp and triclamp fittings. smooth inside. 304 or 316 stainless steel Grade A Sanitary INOX Requires Professional Welding Related 4 inch Triclamp, Tri-clover, Clamp parts; 1000-004 Buna Rubber Gasket 1000-010 Teflon PTFE Gasket 1000-020 - Silicone Gasket 1000-444 basic econo clamp 17232 H.D. SS clamp 1000-099 End Cap for 4 inch Sanitary Stainless Steel Clamp 1000-324 Clamp Long Weld On ferrule 1000-334 Clamp Short Weld On Ferrule 1000-314 Roll On ferrule for 4 inch sanitary stainless steel tubing