Very easy to remove and test. It is a check valve with a vent. It's called a vacuum breaker. Water pressure actuates the valve and directs it to the tank, sometimes it can get stuck, half open and closed causing a leak. Pull it out and inspect and test it.
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Jason & Wendy
2014 F350 Lariat 6.7L PSD
2015 Keystone Montana 3711FL
B&W Patriot 16k fifth wheel hitch
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