Weil McLain combination pressure-temperature gauge for boiler models (all sizes):
Product Details:
| Used With: | 68 Boilers 76 Boilers 78 Boilers 80 Boilers AHE Boilers CG Boilers GV Boilers HE Boilers HE II Boilers VHE Boilers |
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You will need to drain the system to install this unit, and you can wait until the spring to replace it.
The probe on the 510-218-097 gauge is about 3". That would probably be the closest match.
According to the manufacturer, the 510-218-099 gauge is the correct one to use with with your boiler.
The shank on this unit is 2 1/2".