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Thanks so much guys. I feel ready to make this attempt. I will definitely post updates when I make the repair. -Rob

Hi Guys, I do have 2 Taco flo-check control valves. One on each of the two heating zones, basically at the end of the black pipe that the expansion tank hangs off. So there is about 25 feet of that black pipe, then the flo-control valves and then the copper pipes running to all of the...

That sounds like good advice ; ) Thank you. There are some other in-line parts that do look like flow control. I'm going to take some more picture tonight. -Rob

Diehard, Thanks for the great response. Boy was I mixed up. I think your response has me straightened out now. Regarding the "expanding coupler", it looked to me at first like the pipe between the circulator and the water tank was smaller than the threaded connector, but I can see now that...

Doing a little more research it looks like the copper pipe coming into the input side of the pump is 3/4, but is using an expanding coupler to 1 inch. So I'll order the 1 inch flanges. When replacing the flange is it simply using thread tape and screwing it on?

Hi All, I've got a leaking circulator pump on my boiler. It appears that the gasket has failed and the exposure has done some damage to the flange and possibly the pump housing as well. I'm certainly no plumber but I'm pretty handy, so I'm going to try and replace this myself. Here is a link...