Hose ID is the interior diameter of your tubiing/hose it is generally marked on the side of most lengths of hoses/tubing. Tubing Hose ID and Barb Hose ID Must Match
 
Our quality barbed/threaded connectors/couplers are manufactured FasParts' highest standards. They are perfect for connecting lines for air, water, fuel, oil and inert gases.
Suitable for use in Automotive, Nautical, Industrial, and Commercial applications.