The hand pump is not an easy product to make. People think it is simple, but it is not. First, ours is water-cooled. Secondly, there must be a balance between rough and smooth surfaces of the tubes. This is for ease of pumping due to lubrication with oil. The tubes must also be checked for imperfections, such as pits or ridges on the surface, as well as scratches on the metal. The surfaces must also be specially treated (using a proprietary process) to allow the metal to hold oil as a lubricant within the pump.
At Sumei, we manufacture the highest quality hand pumps in the industry. And with our commitment to R&D we continue to improve our hand pumps. Most companies just made hand pumps and kept reducing the price – and the quality – until finally, when they could no longer lower the price, they stopped making hand pumps. They then entered the compressor field and started doing the same thing.