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Q & A - Wetbacks / Re: Wetback noise
« Last post by Plumber on April 01, 2020, 05:46:08 PM »Nothing is ever 100%. What im suggesting would be the most common reason for what you are describing. The valve should be visible behind the wetback, to be sure, light the fire and watch it to confirm. Also make sure the wetback is open vented (just to be safe).