two valves are connected to each other with gauges
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YAUNJI Propane Refill Elbow Adapter with Tank Gauge, 2024 New Propane Tank Adapter for 1 lb Tank, Universal Propane Gas Gauge for BBQ Gas Grill Cylinder RV Camper (2 PCS)

PRICES MAY VARY. 【Top-Rated Propane Refill Elbow Adapter with Tank Gauge】Propane QCC1/Type1 Elbow Filling Adapters are built and tested to strict quality control standards, made of solid brass to ensure your safe leak-free operation and provide good weather resistance, safe and durable. 【Wide Application】This QCC1 Propane Filling Elbow Adapter can easily connect your large to a 1LB propane tank without any tools, easily opening and controlling the filling process. Suitable for heaters…
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