Plastic tube branch fitting for gas service connector

Abstract From the Canadian patent

Abstract of the Disclosure, The side outlet branch connection of a gas service connector is internally threaded at the first and third of three successively enlarged diametral steps which are shoulder separated from inlet to outlet. Secured extending outward from the innermost thread and adapted to support received plastic tubing is a tubular metal insert. The insert is formed from about its central portion to its outboard end in tandem sections of increasing diameter each, of which includes a plurality of longitudinally spaced concentric ribs. The intervening spacings between ribs in each of the tandem sections are of controlled dimension and diameter relative to initial wall thickness of …