ASCO PRESSURE OPERATED VALVE 398 SERIES ASCO VALVE 398 3/2 U STAINLESS STEEL BODY WITH DIN FLANGES PN40 DN25 OPERATOR D=100 Option 666322 ( ACCESSORY AND SPARE PART FOR ASCO VALVE 298 AND 398 SIGNALLING BOX MOUNTED ON VALVE 298-398 PILOTING GAS 2 MECHANICAL SWITCHES DN20-25 OPER.100 (SM2) )