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Replaces old part numbers DS-3903301 and DS-3920020.
This is a Thermostat Seal for Cummins B5.9M, B160, 6B5.9, B5.9-M220, QSB4.5, B3.9-M250 and QSB-110C engines. This item is a new replacement part shipped with a 12-month warranty.
Call us at 888.687.0539 if you have any questions about this item. As always, your satisfaction is guaranteed!
THERMOSTAT FOR 4BT 3.9 / 6BT 5.9
Call for price
RECTANGULAR RING SEAL - 4BT3.9 / 6BT5.9 / ISB3.9 / ISB4.5 / QSB3.9
$0.97
THERMOSTAT (180degF / 82degC) - 6BTA5.9-G3 / B4.5 / B5.9-M220 / 6B5.9 / 4B3.9
Use with DS-3923331 Seal
$27.92
