This seal kit is CAT Pumps models 3DX25GSI and 3DX30GSI. It contains parts needed to repair the seals on all 3 of the pumps plungersCAT Seal Kit for 3DX PumpsKeep your CAT 3DX pumps running smoothly with regular maintenance, including seal repair and replacement, using the 30530 Seal Kit. Regular maintenance prevents breakdowns and excessive downtime! Exact replacement part, don't have to worry about tweaks or adjustments OEM parts guarantee use of correct materials for increased longevity OEM parts come with manufacturer support Check with pump manual to ensure correct part numberContains: Seal Washer - 90D, 46730 (3) LPS Seal w/Steel Spring, 48222 (3) Seal Case O-Ring - 70D, 13980 (3) HPS Seal w/S, 547157 (3)