You can see the difference. Gold Stripe service line polyethylene tubing from IPEX features a permanent gold stripe identification system and sequential numbering. This coloured stripe is actually part of the pipe wall – so it permanently identifies an IPEX manufactured pipe. Unlike copper and steel, Gold Stripe is noncorroding and resists most acids, salt solutions, alkalies, fats and oils. Gold Stripe is conveniently available in both coils and reels. IPEX Gold Stripe is manufactured to copper tube size (C.T.S.) and will not accomoodate normal polyethylene insert fittings.