Product information: 1/2" barbed fitting G1/4 with O-Ring (Perfect Seal)The perfect seal fittings ensure, as the name implies, a perfect seal with 1/2" hoses (approx. 13mm inner diameter). A hose clamp is usually not required, as the fitting has a large outer diameter.
Compatible to hoses with an inner diameter of 13mm (=1/2")
Inner diameter of fitting: 1cm