Not all trailers use the valve. If you have a vent that exits the roof from the kitchen waste tank, you will not have a valve, as it’s not needed. You should be able to locate the valve by following the black plumbing under the sink and looking for a part that rises up from the waste line.
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Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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