Engineered with high PVC housing and double step leakproof seal, this lightweight connectors resists rusting and maintains structural integrity even under harsh environmental conditions OSP20 female head+OPP20 male head: Used for PU pipe with outer diameter of 8mm and inner connection of 5.5mm 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 OSP40 female head+OPP40 male head: Used for PU pipe with outer diameter of 12mm and inner connection of 8mm, Manufacturer: jklymm