This o ring kit is a must for all technical divers and contains 250 pcs of the most used o-rings and 2pcs inflator hose valve. 

Examples:

• HP swivel
• Inflator hose
• MP hose
• HP hose
• Tank valve stem
• Tank valve housing
• Tank neck M25x2
• Din adapter

And many other....

All o-rings are made of EPDM