This is 2 in 1 GAS & CO detector with 3/4 inch electromagnetic valve.

POWER: AC100V~AC240V/50Hz,60Hz
Power Consumption : ≤3 W
MOUNTING: Accessories supplied for wall mounting.
ALARM VOLUME : ≥85db(A) at 1m
OPERATING CONDITION :
Operating Temperature : -10℃ ~ 50℃
Ambient Humidity : 10%~ 90% RH
SENSOR : semiconductor CO and GAS sensor
TYPE OF GAS BE DETECTED :
Carbon monoxide and gas (optional:Butane .Propane .city gas.Smoke and flammable gas. Methane)
ALARM SENSITIVITY :
CO: conforms to EN50291 standard
GAS: <10%LEL .                                                                                  

Packing size:133mm x 102mm x 51mm                Weight:0.29kg

Electromagnetic valve: 3/4 inch (DN20mm)     copper