VHP Stainless Steel Unions are precision machined from 316 stainless steel. Our mechanically strong and reliable union offers zero dead volume (ZDV) allowing tubing to be joined without interrupting the fluidic path. It is designed for 1/16OD tubing, thru-hole of .020 and has a 10-32 Coned thread port configuration. It comes with (2) U-400/U-401 stainless steel fittings.