The Fittings | Rubber Plug (23x29x30 mm) is a tapered rubber sealing plug sized 23×29×30 mm used to cap open ports, fittings, and vacuum connections on VTA and UIC distillation equipment during maintenance, shipping, or storage. Sealing open ports prevents contamination ingress and protects precision-machined surfaces. The flexible rubber material provides a secure, removable fit across a range of port diameters. Compatible with standard port sizes on VTA VKL and VKS series distillation systems.