The Graco 246453 OneSeal makes the seal between the spray tip and guard. These are specifically designed to be used with the blue Graco RAC X SwitchTips and blue tip guard.
Comes in a pack of 5. This includes both the metal and black gasket seal. These are designed to be used with water based materials. If you are using solvent based material, you would want to purchase the 248936 seals.
Part #: 246215
Part #: RAX517
Part #: 248936
Part #: 287032
Part #: 243281
Part #: 224081
Part #: 17P501