Our offices are closed for Thanksgiving. Orders placed online will be processed on Monday 12/1/2025.
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This is a Rectangular Ring Seal for Cummins 4BT3.9, 6BT5.9, ISB3.9, ISB4.5 and QSB3.9 engines. This high quality aftermarket replacement part is guaranteed to meet OEM specifications and is shipped with a 12-month warranty.
Call us at 888.687.0539 with questions or buy online. As always, your satisfaction is guaranteed!
ALTERNATOR SUPPORT - 4B3.10 / 6B5.10 / ISB3.9 / ISB4.5 / QSB3.9 / QSB4.5
Genuine Cummins Part
$132.83
WATER INLET CONNECTION - 4BT / 6BT / ISB / QSB
$91.25
BELT TENSIONER BRACKET - ISB
$192.92
SEAL,RECTANGULAR RING
$6.34
$1,553.00
THERMOSTAT SEAL - B5.9M / B160 / 6B5.9 / B5.9-M220 / QSB4.5 / B3.9-M250 / QSB-110C
$5.26
PUSH ROD COVER GASKET - 4B3.9 / B4.5 / QSB4.5 / B3.9-C130
$11.31
