A few people have suggested the our SNORT LPB air vacuum pump is unsuitable for use as an RCABS pump because it will not produce sufficient pressure. They suggest the Smart Vacuum pump is better. I have taken both pumps apart and they are very similar in design, having three separate mini bellows working from a single cranked shaft.
On testing the Caswell pump, I found at 12 volts, the pump would give a pressure of 14-16psi, at 7.2 volts, it gained 10-12 psi. more than adequate for the RCABS bladders.
Further testing showed that the smaller bladder we sell 4.5" x 2" will fill in 3 seconds, the 6.5" x 3.25" in 10 seconds and the 8.5" x 4.5" in 20 seconds.
The Caswell LPB pump has two pipe connection tubes, unlike the Smart pump which has its intake on the side, through vents, making it very difficult to connect to.
Our smaller pump has only two bellows inside, and it has been reported that this allows air to feedback over time.
I have ordered a supply of small check valves to place in line, preventing this. These units are used in saline drips, so if you want you scrounge one, next time you're visiting your pal in hospital, just snip the valve out of his line.!