Channel Lock is a brand name for a lot of different types of tools. Many still made in USA. That nut is thin and can be messed up with those groove lock pliers. They do come in handy though.

Dennis,
From my phone.
________________________________
From: Carl Hansen<mailto:carl_hansen@IEEE.ORG>
Sent: ‎1/‎4/‎2014 9:36 PM
To: vanagon@GERRY.VANAGON.COM<mailto:vanagon@GERRY.VANAGON.COM>
Subject: Re: 88 GL - Oil Cooler R&R

Channel Lock?

Ch

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Date:    Sat, 4 Jan 2014 16:15:52 -0600
From:    JRodgers <jrodgers113@GMAIL.COM>
Subject: 88 GL - Oil Cooler R&R

I am almost ready to remove the cooler after my big oil leak. Have new
O-ring, new filter and oil ready to go, and an exquisite 3/8 internal
pipe wrench.

Question:: Does the big nut threaded on the pipe though the oil cooler
have to come off before the pipe itself can be backed out? Or is the nut
there just to set the position of the cooler on the pipe?