Cummins 6CT diesel engine part 3968559 thermostat, with thermostat list as:

manufactured by joint venture of US Cummins in China. We also sell other Cummins models,
including 4BT3.9, 6BT5.9, 6CT8.3, 6LT8.9, ISZ13, M11, NT855, KT19, KT38, KT50, ISBe4.5,
ISBe6.7, ISLe8.9, ISF2.8, ISF3.8, ISMe11, etc, for stationary generator set, water pump set,
fire pump set, construction and engineering machinery (road roller, wheel loader, excavator, bulldozer, forklift, hoister, trailer, etc), automobile (bus, coach, van, MPV, SUV, pick-up, etc), marine main propulsion, marine auxiliary generator set, etc.
Besides, we also sell other parts, including cylinder head, cylinder head gasket, cylinder block,
cylinder liner, piston, piston ring, main bearing, conrod bearing, injector, oil pan gasket,
overhaul gasket, upper gasket kit, lower gasket kit, oil pan, cylinder head cover,
fuel injection pump, fuel transfer pump, water pump, oil pump, oil filter, fuel filter,
fuel water separator, air filter, etc, as well as other brands, such as Deutz, Perkins, Isuzu,
Fiat Iveco, VM, CAT, Toyota, Nissan, Suzuki, Yuchai, Weichai, Changchai, etc.