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Diabetes Health Supplies is your source for Replacement Tension Rings and Tension Ring Kits. Tension rings (also known as support rings, ed ring or constriction rings) can be used on any FDA approved vacuum therapy device. These support rings help keep blood from leaving the penis once an erection is obtained. At Diabetes Health Supplies we carry three brands of tension rings and ring kits by Encore, Pos-T-Vac and Osbon ErecAid. Diabetes Health Supplies is your one stop source for Tension Rings and Ring Kits for FDA approved Vacuum Erection Devices.