Big thumbs up on bargainfittings! I got a big load of SS parts and silicone tubing from recently. Which ones you need depends on what you're doing. As an example I'm going welded. HLT will have a ball valve out and a sight glass/thermometer combo, BK with the same plus a ball valve return, and a MLT with a ball valve out and return and a thermometer. Parts list of 8 couplers, 5 ball valves, 8 threaded nipples, 3 thermometers, 3 tee's, 2 sight glasses. I'm sure I'm forgetting something. Camlock QD's all around. Best advice is plan it out and draw a picture so nothing is missed.