Temperature Gauge Adaptor; Size A 3/4 Inch; Size B 3/4 Inch; End Connection Soldered x Soldered; Material Brass; Applicable Standard NSF/ANSI 372; Lead-Free; Gauge Scale 30 to 210 Deg F; Gauge Accuracy +/- 6 Deg F; Gauge Dial Size 2 Inch Diameter; Used with 521/5231 Series Mixing Valve