Stock replacement cup seal to fit BT Combat series (Delta, Omega, ERC etc), Tippmann blowback markers and Valken SW1 / Blackhawk.
Changed all your o-rings and gun still leaking? Next step is replacing your cup seal which is located in the valve of your marker - knowledge of disassembly required.
Please confirm if you are unsure whether this product will fit your paintball gun as we can't be held responsible for items ordered incorrectly.