A worn piston can very often cause premature failing of packings. If your pump needs to be repacked more often than when it was new, the cause could be a worn or damaged piston. The rod needs replacement if your old rod has more than .004 inch wear in the middle of the seal area, or if you can catch your fingernail on a vertical grove in the rod.
This piston replaces your worn or damaged Airlessco 331093 & 331708, (331-093, 331-708).
Applications:
Airlessco LP (Little Pro) Pumps: 460 / 540 / 690 / 2400 / 2500 / 2600
Airlessco Power Pup 4 / 5 / 6
All Pro 400E / 500E / 600E
Pro Spray 402 / 404 / 505 / 606
Sure Stripe 3650 & 4050
Airlessco 800 (gas)
Airlessco 4000 Linestriper
Always check your manual for your specific application.
Note: When replacing a piston you must also replace the packings. Use Airlessco repack kit part# 331210.
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