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Does what it is suppose to do...no problems. It's cheaper to replace the seal, than buying the whole pump. One thing of note, there was no instructions, resulting in trying to install backwards, as the old seal was totally crumbled to pieces and not able to see how original seal was installed. I quickly found out when the new seal came off the push rod after installing. After spending about 10 minutes retrieving the new seal from inside the tube with a straightened coat hanger, I reversed it installed without any further problems. It works as good as new now. Of note also, the prices on this item vary widely, so shop around on Ebay.
Verified purchase: Yes | Condition: New
This Zefal piston seal arrived earlier than I had expected. It fit perfectly and now my favorite high pressure frame pump can once again put out more than 100 psi!! Thank you so much for having such parts. Bart rider of 1979 Motobecane Grand Touring bike
Verified purchase: Yes | Condition: New
I bought my Zefal HP in the 80's and used it for years. Never occurred to me to lube it. Eventually, the rubber piston seal wore out, and the pump would no longer build much pressure. This seal fixes that problem. Easy to replace--the old seal pulls off, and the new seal goes on very easily. The pump now works as new.
Verified purchase: Yes | Condition: New
The part fit perfectly in my old Zefal pump, working like new again. It was a bit pricey for a small part, but much less than buying a new pump, and I would have hated to throw away my trusty old one.
Verified purchase: Yes | Condition: New
I wanted to refurbish an aging Zefal bicycle hand pump - perhaps the best hand bicycle pump ever made. I bought this part, installed it in about 5 minutes, and my pump worked like new.
Verified purchase: Yes | Condition: New