Check the listing for details. Citadel Warthog 12 Gauge (12ga) Barrel Seal O-Rings (4 Pack). Condition: New. Listed at 12.29 USD. Citadel Warthog 12 Gauge (12ga) Barrel Seal O-Rings (4 Pack) Product Features: Replacement o-ring for Citadel Warthog 12 Gauge Highest grade synthetic rubber o-rings replace old, worn, or cracked orings to provide a proper seal and restore gas system reliability. Used to resolve blow back issues with 12 gauge gas ports in your Warthog shotgun. Material has high temperature, compression, and operational tolerances. Up to 316 C (600 F) and down to -54 C (-65 F). O-Rings measure approximately 1" inside diameter x 1.125" outside diameter (Actual Dimensions: 0.989" ID x 1.129" OD) Manufactured and Warrantied by Captain O-Ring LLC Replacement o-rings for Citadel Warthog 12 Gauge shotguns. Highest grade synthetic rubber o-rings replace old, worn, or cracked orings to provide a proper seal and restore gas system reliability. Used to resolve blow back issues with 12 gauge gas ports in your Warthog shotgun. Material has high temperature, compression, and operational tolerances. Up to 316 C (600 F) and down to -54 C (-65 F).