I need a 70mm length of pipe/tubing to replace the pump to boiler hose on my Imat Junior Mk I. The original hose was PTFE/Teflon, either 6.00mm or 6.35mm. The plumbing shops only appear to stock 6.35mm copper pipe, which is too big for the compression fitting caps, and I cant find a source for PTFE/teflon. Any suggestions? Id happily swap any appropriate off cuts for a ~300mm x 6mm section of copper.