22mm Straight Coupler 301. Fits all standard size waste pipes. High quality brass fittings made to EN1254-2. Suitable for Copper or Stainless Steel tube and plastic pipe, Conex compression fittings are ideal for use in domestic and commercial heating systems, air pressure lines, fluid distribution and air conditioning systems. High quality brass fittings made to EN1254-2. WRAS approved. Kitemarked.