Trying to plumb my uv and I’m stuck. Need to get certain fittings but afraid to get the wrong size. Confused to say the least lol. Would like my lines to be as small as possible because I’m running low flow and hoping to eliminate any chance of air pockets inside chamber. Need to figure out how to mount this UV so output is facing up. But for starters need to find a fitting that can mount to my return then to some flexible tubing. Went to Home Depot yesterday, spent an hr and left with nothing lol.