Etc threaded black pipe, a o smith oil burner, aquastat - general...
Resideo/Honeywell L8148A Aquastat Relay. Used only a week. Works perfectly fine: $150 AO Smith oil burner: $100 Threaded black pipe: $125 new (4) 1 1/4" x 10" nipple (2) 1 1/4" x 4" nipple (1) 1...