Your RV propane system needs to hold pressure when closed. If pressure drops, propane may be leaking. This adapter connects a manometer to compatible 3/8" OD propane tubing so you can test for pressure loss before using your appliances.
When your RV propane system is closed for a leak test, the pressure needs to hold. If it drops, propane may be escaping somewhere in the system, creating a fire hazard if the leaking gas reaches an ignition source. A manometer lets you watch for that pressure loss, and this adapter provides the connection needed to test compatible 3/8" OD propane tubing.
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