If you are using the GAS ITDN6/6.5 thermoplastic LPG pipe and want to join 3 thermoplastic pipes together then this is the GAS IT item you need.
All you ned to do is cut the pipe in the lengths you want and then simply insert them in the specific Tee piece, fit the supplied split olives and tighten up the nuts and and away you go - it really is that simple.