I don't think I've seen Teflon pipe in a size that big. If it is made, it is probably astronomically expensive. You are probably better off getting sheet and wrapping it into a tube. See www.smallparts.com. Mike, W1NR MIKE DURKIN wrote: > Where is the best place to get ptfe 4in Id pipe from ?? Yep, for a GS35B ... > > KC7NOA > >