For sale is this Minneapolis-Honeywell Surface Aquastat. Type F-110 - 110/220 Volts - 10/5 Amperes - 1/4 H.P.S.P. - 3/4 H.P.R.I. Worked when removed 20 years ago. We will say untested. The unite measures 5 1/4 in. x 4 1/4 in. It's 2 1/4 in. high.