Very nice detailed rebuild instructions. These pumps are really pretty simple to rebuild after you have done a couple. I also did not like the idea of paying over 20 dollars for a single use/disposable air filter for these pumps. I found a very compact air compressor filter with a metal housing and replaceable paper filter element on E bay. They cost $8.85 w/shipping and have the 3/8" male threads. Replacement filter elements are $5.75 w/shipping. I have been using one of these for about six months and it has worked great so far. If anyone would like, I can post a link (if appropriate on this site) for them or you can PM me.