Gas species for control valve: natural gas, LPG, man-made coal gas and other noncorrosive gases Valve body materials: ... valveGas species: natural gas, LPG, man-made coal gas and other noncorrosive gasesValve body materials: brass alloyMaterial for sealing: NBR rubberOperating ... 00441Connecting wire length: 0.4mConnection polarity: white wire for positive, black wire for negative Control Valve(HM-510)