The 2102x Series diaphragm pump is said to provide the highest vacuum levels from a pump of its size. The pump, which measures just over ½ in. in thickness and weighs less than 1 oz., has been upgraded to reliably achieving 27-in. HG and 30 psi.
Dynaflo Inc., 127A N. Mill St., Birdsporo, PA 19508, (610) 404-7020, www.dynaflopumps.com/products/2012x.html