Adi
You can buy a
DC motor speed control kit at Willy's Electronics. There are several similar kits on the market. Most are pulse width modulators that you build yourself. I got one for the bait tank that I made for my Prowler. I never used it because it was too large and wouldn't fit the battery box. I think I still have it floating around somewhere. Got a soldering iron and some spare time?
The 7-14 works well on the Kayatank in my X-Factor; no overflows. I've also got a 3-17 switch that I was thinking about installing with a selector switch. That would allow me to select either a high or low flow, depending on the size and number of bait in the tank. Another project for a rainy day.