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It's 3/4 inch in diameter on the valve side and 13/16 inch diameter on the hose side
H-R connector adapt inflatable boat foot pump or electric pump hoses to fit Halkey-Roberts valve.
Fits H3 valves for connection to electric pump compressors,fits Naru valves on Wahoo and Wakooda iSUP
For use with all Aquaglide products that use the H3 or Halkey Roberts Valves.
In order to use a regular electrical mattress inflator on inflatable paddleboard , ten toes board, inflatable GYM
Melchef Halkey-Roberts HR Air Valve Adapter Inflatable Boat Foot Pump Halkey-Roberts HR Hose Adapter H-R Valve Adapter Roberts HR Air Valve Adapter B07BFDR9HJ