3/4" Threaded Spring Loaded Check Valve, Lead Free

I wasn't sure what I needed here for a well pump tank tee I was installing and I didn't have the time to search through the selections (it was close to the 6:00 pm - next day delivery deadline). Thank you for being willing to recommend this one - it was an excellent solution. I added a 1" brass EL, IPS Male x Female, to head things in the right direction, but it would have done fine just by itself - with the polypropylene pipe adapter (1" barbed x IPS Male) that I needed regardless. Thanks for your assistance and for answering all my questions!

I recently replaced a Weil McLain series 1 Ultra Boiler with a new series 4 Ultra Boiler sourced from SupplyHouse. FYI, the Ultra Boiler requires a piping scheme which hydraulically isolates the main boiler loop from all zone loops. However, as you might expect, the hydraulic separation is not perfect, so the zone circulators can and do cause pressure fluctuations in the main boiler loop. These pressure fluctuations cause this check valve, which is installed in the main boiler loop, to rattle like crazy, especially when the boiler cycles down and main boiler loop shuts off but a zone loop circulator (or circulators) continue operating. I suspect that the spring in this check valve is not sufficiently strong to not be affected by the interactions between the main boiler loop and the zone loop(s). In the old series 1 installation I used an oversized massive 1 1/2" Watts check valve mounted vertically and never had a problem with chattering caused by loop interaction. To remedy the chattering problem, I am reinstalling the old Watts check valve which is still in perfect shape even after approx. 21 years of service.