Prevent issues in your 01-04 GM 6.6L Duramax LB7 with a new set of fuel injector cup O-rings.

The injector cups in your LB7 are known to corrode and sometimes seize and take out the O-rings, that can lead to cross contamination of coolant into your engine oil.

Replace your factory worn injector cup O-rings with these quality replacement from Merchant Automotive. Sold in a set of two (services 1 injector cup) or a full set 16 (services 8 injector cups).