3 Fuel Class A and CAT. Series 4 (Version B) Fuel Class A, CAT CG132, Caterpillar Stationary Gas Engines (meets), CG170, CG260 – TR 2105, Dual Fuel (Pilot Diesel) (meets), GE INNIO Jenbacher: Series 2, Hyundai H35/40G(V) series, KG-2, KG-3, Landfill Gas/Digester gas/Biogas), MAK: GCM 34 Category 1, MAN D&T : Medium Speed Engines for gas operation, MAN: Ruston Engines (Natural Gas, MTU: Series 4000 L32/L33/ L61/L62/L63, MWM gas engines – TR 2105, Nuovo Pignone: Reciprocating Compressor Service Class A (meets), Perkins: 4000 series, Rolls Royce: KG-1, S.E.M.T Pielstick PC - Dual Fuel engines, W 175SG, W 20DF, W 220SG, W 32DF, W 34DF, W 50DF, W 50SG, W25SG, W28SG, Wartsila: W 34SG, Waukesha: 220 GL (Pipeline Quality Natural Gas), Waukesha: other gas engine types (meets)