【Standard Connector】:QCC1/type1(Acme Nut )propane gas fitting adapter x 1/4" male NPT ( plus 1/4" inverted flare fitting).Common to RV standard two-stage regulator and auto-changeover two-stage regulator 【Application】:Connect your camper's 1/4" NPT inlet regulator to a 20lb-40lb LP propane tank. Also compatible with the auto-changeover two-stage regulator to a 20lb-40lb LP propane tank. 【Clearer pressure gauge】: This gauge allows you to monitor the fuel level without necessarily removing the tank. Because it comes with the gauge in 3 different colors dial to help you read and monitor the gas levels clearly and easily, and detect dangerous leaks. 【Upgraded version more durable】:12 inch RV propane pigtails hose made of high quality stainless steel braided and solid brass fittings. Stainless steel braids are very durable and may last twice as long as ordinary rubber hoses. 90 degree propane regulators pigtails hose easily connects to propane tanks and RV's two-stage regulators 【Safety】It passed CSA Certified, ensuring your safe and leak-free operation. Note: Please use a wrench to tighten the connection between each thread adapter。 Stainless steel braided for better protection against animal chewing. 12" Stainless Steel Braided Propane Hose with 1/4" Male NPT to 1/4"Inverted Male Flare & QCC1 Connector for Standard Two-Stage Regulator, BBQ Gas Grill Camper