Features Replacement gaskets for Imer Camlock Coupling Hoses Creates a tight, leak-free seal inside DN 25 cam and groove material hose connections Durable black rubber designed to withstand pressure and abrasive mortar or grout flow For use with camlock hoses with Imer pumps: 3/4" (19 mm) = Mighty Small 50 1" (25 mm) = Mighty Small 50 and Koine 3, 35 & 3.1 1-3/8" (35 mm) = Step Up 120, Prestige 300 and Koine 4 & DUAL 2" (50 mm) = Step-up 120 and Prestige 300