Cornelius Probe Assembly Insert Mold - Replacement Sanke Coupler SealThe Cornelius Probe Assembly Insert Mold is a critical replacement seal for commercial grade Sanke keg couplers. This precision molded component creates the primary liquid seal between the coupler probe and the keg valve (spear). A damaged or worn insert is the #1 cause of leaking beer at the coupler connection or "spraying" when a keg is tapped. Constructed from high durability, food safe rubber for long term service in commercial bars. Technician's