Hi everyone,i have a problem that has arisen through my looseing a part of my heater whilst it sat around disconnected during a reno.it is a rinnai energysaver 1001 and i am needing the exhaust sub tube that steps down from the exhaust slide tube to the mushroom flue.Because this heater is now getting on a bit Rinnai have no parts and aftermarket parts arenot available.Does anyone have any second hand heaters they would be willing to rat this part from?I would really appreciate finding this part as at this stage i am up for buying a new $2500 heater and that is not going to be possible due to financial reasons.thanks,Danny