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A 3/8 Allen key.
Try 3/8 Allen key , or 15 mm wrench.
if it is the same as the 2004 then you would be looking for a 14mm or a 9/16 size
15mm wrench
what size speakers are in the 2004 Chevy Avalanche
The 2004 Chevrolet Express has a 4.3 L base engine size.
The 2004 Chevrolet Express has a V6 engine.
Use water pump pliers, they fit almost all oil filters.
The wrench size should be 15mm.
You need a 10mm wrench.
t55
Probably about a 15 millimeter wrench or socket.