You are using the correct part #34120 but the ball seal/seal will NOT fit the Aqua Magic II. This ball valve seal is 4-3/4 inch in diameter and does not fit in the plastic ring at the bottom of the toilet. The correct ball valve seal is 4-1/4 inch in diameter. Get Revain's OEM Thetford Gasket Kit with the same part #34120 for $20. This seller was great and refunded the purchase price immediately with no problems.
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