Need advice on installing an oil filter adapter

408 swinger said
If the nipple doesn't have the hex on the outside like in the pic, then it will have 3/8 square in side the thread. Just use a 3/8 extension and ratchet.

BrianT said
That would have thrown me for a loop too?!?! I guess even at our age, we learn something new every day!

They make them both ways. one with an external hex on the outside, and one with the 3/8" square on the inside...

The problem with the external hex drive is the hex is thin and sometimes hard to keep the socket from slipping off...