The Tippmann O-Ring. This is the most common O-ring needed on a paintball gun. áOften called a tank o-ring or a bottle o-ring. Stock up on some spares.

This product is used in the following guns: A5 Basic, A5 Response, A5 E-Grip Electronic, A5 Stealth, 98 Ultra Basic Non-ACT Platinum Series, 98 Custom ACT Platinum Series, 98 Custom Pro ACT Platinum Series, X7 Basic, X7 Response, X7 E-Grip Electronic, Pro Carbine, TPX.

The Tippmann Part Number for this product is 18-PA.