Kaplan’s pumps are quality, but I don’t like them that much and they are overpriced. Kaplan’s pumps narrow slightly toward the end of the tube (not the end you stick your dick in). This is not ideal to getting a nice even fat shape.
The novelty/porn store pumps are fine to start with, but they tend to break down after awhile.
I have ordered pumps/tubes fro Boston Pump works and from the guy who runs https://www.monsternuts.com. The monsternuts tubes are cheaper and work great. Plus he will make it in any size you want. I suggest getting the brass hand pump. They work forever and withstand any water, heat, cold, etc. Never used an electric model, but I prefer the mobility of the manual way.
Whatever you do, go slow, not too much pressure at first, and take a break every 20-30 minutes. If you over do it, you can get a rather painful water blisters on tyour dick head. OUCH!