The tee set up we purchase for our 2013 378ts was designed to screw into the propane line outlet before the regulator so the cross over line supplies non regulated propane to whatever you connect to it. Then the grill uses its own regulator . The kit comes complete with the tee that goes inline between tank out line and regulator, end caps for the tee fitting that goes to the cross over line. and the crossover line. I think the kit was about $75.00 at Camping World. The tee itself has a check valve for the crossover fitting so you can disconnect the crossover when not in use without having to shut off the propane tank supply. All the threaded fittings are correct male/ female threads so no other adapters are required. End caps are also in the kit. Since the crossover line is rubber I never travel with it connected.
Mickey & Sue Stamper
2013 GT XL 378TS
2013 Ford Escape on Landgrebe tow dolly