The Graco 17P501 OneSeal makes the seal between the spray tip and guard. These are specifically designed to be used with the green Graco RAC X FFLP (fine finish low pressure) SwitchTips and blue tip guard.
The Rac X FFLP OneSeals come in a pack of five. These tip seals create a main seal between the sprayer gun, tip, and tip guard, and prevents paint from leaking from the threads at the guard.
Part #: 246382
Part #: 287033
Part #: 17P502
Part #: 103413
Part #: 246453
Part #: 248936
Part #: 243281
Part #: FFLP
Part #: LP