• Size: hard plastic. It's 0.8 inch in diameter on the valve side and 0.55 inch diameter on the hose side
• Each valve adapter set includes 3 rubber 0-rings (washers) of different thickness,5.2mm 5.2mm 3.0mm please find the right 0-ring to seal better
• Univesal fit: connection nozzles for pump, replacement hose attachments compatible for most electric pump which comes with inner threaded hose and connection parts
• Function: valves for connection to paddle board air compressors, inflatable kayak electric pump
• AFTER-SALE SUPPORT: If you have any questions or concerns, please do not hesitate to contact us. We will do our best to provide you with a satisfactory shopping experience