The HV-109 cuff is a hose to inlet connector made of vinyl plastic. It comes standard on the H-130 and HS-130W hoses. It is suitable to use with most 1-1/4 inch standard central vacuum valves and hoses.
The HV-125 cuff is a Hose to Inlet Connector with a metal ring. This metal ring makes it suitable for use with pin jack valves. This cuff converts 1-3/8" hoses to work with 1-1/4" pin jack valves.