Northwoods Sugarworks lunchbox diaphragm vacumm pump/releaser. Runs off of portable air compressor. Used 3 seasons on flat ground. Works great for under 100 taps. As photo shows, was able to generate -20 to -25 Hg of vacuum. Has custom made 1/2 inch clear plastic manifold that connects to 3 - 5/16 laterals. I replaced the pump about 2 years ago. email me if interested at mspina14@gmail.com.