1/2 hp Rocking Piston Vacuum PumpWith twice the horsepower as the 2502 A model, this rocking piston vacuum pump compressor delivers outstanding perfomance for more demanding applications. The 2503 A vacuum pump compressor offers all of the same benefits as its smaller sibling, but with almost double the CFM and increased PSI. This family of products can be upgraded with Sound Shield which delivers up to a 25% dB(A) drop and a 40% Sone decrease compared to our standard offerings.