That should be a large ball valve which hardly ever go bad. There might be some small debris in it. Just open and close it all the way a couple of times, and see if that stops it. It also could be the clap on it needs to be tightened.
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Jeanie, Ed & Slade the GSD(RIP)
Cape Cod, MA
2017 Entegra Aspire RBQ & Silverado Crew or GC
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