these work great just a quick fyi I did find a wand that you attach to a garden hose and use to flush out the water heater I just got it this summer and used it for the first time when I closed up this fall my camper is an 06 and I have never done anything but drain out the water heater before WOW did I get a lot of scale out of it with that wind I'll do it again next spring when I open it up for the season it should really help it work well