This is a box of hydronic heating parts. Listed as open box but most are NEW in the box. RInnai, HTP, Bosch GreenStar, Universal indirect tank / water heater sensors, aquastat L4006A2211 , outdoor temp sensors, 10K ohm sensors. I've thrown in a couple of extra parts, like a 1-inch of webstone press ball valve for example. This package priced out amounts to over $700 worth of parts. There are several hy vents / air vents (1/8"), to a pressure relief valve Apollo 10-407-05 , and more. This would be a great kit for any HVAC business, or even a facility that has forced hot water heating appliances. Pay for an aquastat and everything else is included.