This sealing ring will directly replace your existing ring. The kit includes the sealing ring and a replacement rubber over-pressure plug. Fits Common Models - 803 803B 804 804B 833 C301A C401A C401B(PCS4) C601A(PCS6) C603A(PCS6) 01/PCS4 02/PCS4 01/PCS6 02/PCS6 (May fit other models)