Don't waste your money
Pump piston inside spun about 3/4 of a turn then suddenly stopped. Even though I knew this was an aftermarket part when I bought it, I was hoping it would still be decent. I would not recommend to anyone. There should be a ban on allowing cheap imports on critical components like this. Typically with aftermarket parts, buyer beware. The problem with (cheap) aftermarket parts is there's no quality control on their manufacture. You might get lucky or you might not. A saw without lubrication at best will destroy just your bar and chain. Worst case scenario, the excessive heat build up in the bar and chain can lead to wood catching fire and lead to forest fires in dry/hot enough weather. After a few minutes of messing around trying to make it work, I decided to throw it out instead and not install on my saw. I also noticed that the oil set screw didn't have a taper on the end that contacts the piston. I doubt there'd be much control on oil flow rate without this taper on the set screw.
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