Octi-Ring is the name of this line of octagonal O-ring seals conceived for those demanding retrofit sealing applications that traditionally would have required a high cost in labor and downtime of cutting a special seal groove. The hardier seal also minimizes the likelihood of damage during cylinder assembly operations. The company offers the line in virtually every common and many exotic seal materials. Octi-Rings are available for 1/8 in. ID to 80 in. OD with every size in between.