Maintenance Kit for Gast 0323 and 0523 series oil-less rotary vane pumps. Fits most 0323 and 0523 units including 0323-101Q-SG588DX, 0523-101Q-SG588DX, 0523-V184T-SG588DX and 0523-V191Q-G588DX models. Includes: (4) DuraVane carbon vanes, (1) AK521 gasket, (2) AK524 filters, and (2) AK473 o-rings.