50 year old Burnham boiler was having major pressure problems with gage running into the red. Bleeding off water would bring down for a while. Old pressure tank was about 20 years old and just copied the model numbers off it and sure enough they still make the same model with same specs. Took longer to empty the system of water than it did to replace this pressure tank. Simple unscrew old and screw new one on with teflon tape. Pressure now stabilizes and works like new. Probably saved myself several hundred dollars for this diy rather than calling a furnace company to come out.