OSP30 female head+0P30 male head: Used for PU pipe with outer diameter of 10mm and inner connection of 6.5mm The selflocking C styles quick connectors coupler features 1 handed push to mechanism and resistant steel beads, ensuring secure airtights connection for pneumatic tool and plumbing systems OSP20 female head+OPP20 male head: Used for PU pipe with outer diameter of 8mm and inner connection of 5.5mm Engineered with high PVC housing and double step leakproof seal, this lightweight connectors resists rusting and maintains structural integrity even under harsh environmental conditions OSP40 female head+OPP40 male head: Used for PU pipe with outer diameter of 12mm and inner connection of 8mm, Manufacturer: Uitndvyte