Dave,
Del-Aire used to make pneumatic systems but went out of business a few years ago. Stretch Manley developed the E-Z Air product line when Del-Aire stopped producing. I use both for the switches I cannot reach. While Del-Aire made good products, the E-Z Air line is even better in my view. Very reliable, and very powerful for such small machines. The secret is to ensure your connections are airtight, which is typically not a problem. I have found they work reliably on about 30 PSI but 40 PSI is recommended. I have a compressor that generates 125 PSI. I fill a portable tank (available in most auto supply shops) from the main compressor. I use two output regulators. The first is designed for air tools which I use to drop the pressure from 125 PSI to about 40 PSI. The second is an air brush type regulator that provides a finer adjustment (probably overkill, but I didn’t want to risk blowing out the switch motors â€" and I use the same tank for my airbrush). I also have a moisture trap on one of the regulators given the kind of compressor I’m using. One tank of air will last a long time. Stretch Manley is good to work with. The directions on his web site are very complete.
Hope this is useful.
Mike