Replacement Thermostatic Sensor Cartridges

Description: 

Fits 280 and 281 Series boiler protection valves.

Easy replacement to change the 280 valve set temperature without removing the valve body from the piping.

Sensor cartridge accuracy:  ±4°F
 
By-pass from boiler complete closing temp:  Tset + 18°F
   (example:  130˚F + 18˚F = 148˚F)