"One 1 1/2” connecting face for both 1” and 1 1/2” forestry hose. Adapters available in 3/4”, 1”, and 1 1/2” thread sizes. External lugs for faster action, in a " "demanding field where quick connection counts. No threads to damage, hang up, or seize. Complete reliabliltiy. Hardcoated to prevent corrosion and " "abrasion. Industry-wide reliability. Precision molded gaskets are tolerance controlled. Ozone resistant. Red Head “QK” couplings are forged for heavy duty, " and attached with an internal expansion ring. Easy to reattach.