NEVER RUN OUT OF PROPANE - Grill, camp, and heat with ease without the worry of running out of propane. The meter shows when you're running low so you never run out. EMERGENCY FLOW CONTROL - Emergency flow control detects gas leaks and restricts flow to ensure safety and peace of mind. GLOW IN THE DARK DIAL - Easy-to-read glow-in-the-dark dial displays propane levels, even in low light. COMPATIBLE WITH ALL APPLIANCES - Designed to fit appliances with type 1 connection. The gas gauge meter connects easily with no tools required. WORKS WITH OTHER ADAPTERS - Can be used with propane regulators and other propane adapters. This product is a gas cylinder adapter with a pressure gauge to monitor gas volume in the cylinder. External thread: 7/8-14 UNF left-hand thread. Internal thread: 1 inch-20 fine thread. Suitable for gas cylinders. Capacity: 80000-150000 BTU/hour Working temperature: -40°C to +55°C Inlet: 25-250 PSIG Outlet: 2.5 PSIG-20 PSIG Color: Yellow & Black Material: Brass Package Contents: 2 x Propane gauges Note: Light reflection and different display settings may cause slight color variations between the image and the actual item. Measurement may vary by +/- 1-3 cm.