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When a 2-inch waste gate valve starts sticking or leaking at the flange, replacing the valve body is usually easier than fighting it. This Valterra unit uses the Bladex-style design and is compatible with GrenTec, Bladex, Valterra, Bristol, and Anonda valve systems, so it fits into a lot of existing black or gray tank plumbing without a full teardown.
Install the seal on the flange first, slide the valve body between the seals, and snug the bolts a little past finger-tight for a secure, drip-free seal.