Composite fittings GOST

Composite diameter 8 equally strong replacement for 12 diameter metal. Composite reinforcement from 4 to 12 diameters. Certified products, test reports, all permits. Composite diameter 3 equal strength replacement for 5 diameter metal. Composite diameter 4 equal strength replacement for 6 diameter metal. Composite diameter 6 equally strong replacement for 10 diameter metal. Composite diameter 8 equally strong replacement for 12 diameter metal. Composite diameter 10 equal strength replacement for 14 diameter metal. Composite diameter 12 equally strong replacement for 16 diameter metal.