Save A Dive Scuba O-Ring Kit Nitrox Oxygen O2 Compatible for Regulator Cylinder Valve and Hose Repair SAE Aerospace Standard (Save-A-Dive O-Ring KIT (30 pcs))This SAVE-A-DIVE oring kit contains fluorocarbon elastomer (aka VlTON, aka FKM, aka FPM) O-rings that are brown or black in color and 90 durometer hardness. They are well suited for SCUBA appl..