Use Propane Safely, Use GasStop! POL GasStop is an emergency shut-off safety device for propane gas systems. In the event of a major leak, POL GasStop will automatically shut-off 100% of the gas supply immediately-mechanically. A 'must have' safety device to protect families with RVs that have propane systems on board. Manufactured to the highest quality standards, individually tested, and backed by a 5-year warranty. Easy to install, with a high-quality propane pressure indicator the ACME valves or the POL shut off valve.
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