Red Head Brass 7710 Series Aluminum Heavy Duty Expansion Ring Couplings

All Red Head aluminum couplings are  Hardcoat Anodized  per  MIL-A-8625 Type III, Class 1 . No dyes or coloring are used. Hardcoat is a hard, dense coating formed by converting the surface of the aluminum alloy into a hard aluminum  oxide. This process provides the completed part with a  hardened surface  that resists corrosion, abrasion, and reduces electrolysis. It also prevents excessive wear on the threads. Complies with NFPA 1963, 4.12 Corrosion Resistance.

Expansion Rings included with each coupling. Made from  seamless soft anneal red brass tubing, UNS 23000  for maximum expansion without danger of breaking.  Chamfered edge  prevents cutting of hose.