i've got a leak. Looks like there is a collar on the output side of the riser to the heat exchanger and it is spitting a good amount of water. Appears to have rusted thru. I've done a lot of searching for this particular style of riser but cannot locate. any help and/or can one just find the collar to replace?
here is the riser - the area in quetion would be on the right of the pic, where that wire is hanging down.

here is the plate

here is the collar (this is actually the 'good one' but better picture opportunity

here is the riser - the area in quetion would be on the right of the pic, where that wire is hanging down.

here is the plate

here is the collar (this is actually the 'good one' but better picture opportunity

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