I recently decided to go for a Propex heater for my 1990 Wesfalia.  I ordered it from Frank Condelli and got quick efficient service.  Thanks, Frank.  
I have installed it into that little space just before the Water tank.  It is very tight and one has to move the electrics around a bit.  It is in, but here is my problem.  I put in a tee joint on the fridge propane line under the sink area.  How does one get non leaky joints on these lines?  I understand one is not to use Teflon tape and one is not to over tighten the nuts.  What is the secret to getting them gas tight?
Any help appreciated.

Ed Wiebe