Here goes, I have a pool that was solar heater. this was fine but it was not winterized properly and was disconnected. I also have a hot tub with a heater that is 220 that I would like to disconnect. I now have a mini max 100 gas heater. I would like to install a y valve set-up at the heater to heat both. One Y to select which will be feeding the heater and one Y to choose where the heated water will be sent. I have a postage stamp for a back yard so everything is very close. Any suggestions? Also, where would be the least expensive place to buy these valves online?