Our ZDV Union Assembly is Waters Compatible and precision machined from 316 stainless steel. Our mechanically strong and reliable union offers zero dead volume (ZDV) allowing tubing to join without interrupting the fluidic path. It is designed for 1/16OD tubing and has a 10-32 Coned thread port configuration. It comes with (2) U-410/U-401 stainless steel fittings.