Advice regarding drilling holes for tonneau drain tubes - oem spray on liner - Chevy and GMC Duramax Diesel Forum
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post #1 of 19 (permalink) Old 10-01-2019, 12:57 PM Thread Starter
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Advice regarding drilling holes for tonneau drain tubes - oem spray on liner

Hi y'all,

I have installed a Retrax Tonneau cover (well, almost) on my 2019 3500HD. I still need to make holes for the drain hoses. I guess I didn't realize it drains from the bottom of the roll-up box rather than from the top of the rails (duh) so I can't use the factory punch outs as they are way too high.

I need to make holes big enough for the two tubes, which are about 7/8" in diameter each. Going through the bed wall against the cab seems to be the most logical place.

Any advice on drill bits? getting through the spray on-liner cleanly? protecting the newly bare metal? grommets to keep the hose in place? etc?

Thanks for any thoughts.

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post #2 of 19 (permalink) Old 10-01-2019, 01:01 PM
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i would use a step bit, paint the exposed metal, and install a grommet like this if you would like to prevent wear on the hose. The bed liner is just rubber, the drill bit will go right through it.




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post #3 of 19 (permalink) Old 10-01-2019, 03:12 PM
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Local shop installed mine. They ran the hoses out the bottom of the bed. Painted the bare metal from drilling the holes.
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post #4 of 19 (permalink) Old 10-01-2019, 03:20 PM
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Originally Posted by 2THE9S View Post
Local shop installed mine. They ran the hoses out the bottom of the bed. Painted the bare metal from drilling the holes.
That's how my Roll-N-Lock drains. And if the box gets leaves in it and the drains block, the overflow will drain out the same holes, around the clear tube.
I'm always unblocking those drains.

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post #5 of 19 (permalink) Old 10-01-2019, 04:47 PM
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post #6 of 19 (permalink) Old 10-02-2019, 05:27 AM Thread Starter
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Thanks for the replies.

Sold:
2015 2500 CCSB LTZ 4wd Z71 brownstone/cocoa
Current garage:
2019 3500 CCLB LTZ 4wd SRW pearl/cocoa
2016 Spark gas CVT LT2 black/black
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post #7 of 19 (permalink) Old 10-02-2019, 05:31 AM
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I installed the ReTrax on my 2018. Your going to love that cover. It is the best one out there for security and being weatherproof.

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post #8 of 19 (permalink) Old 10-02-2019, 05:31 AM
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Quote:
Originally Posted by 2THE9S View Post
Local shop installed mine. They ran the hoses out the bottom of the bed. Painted the bare metal from drilling the holes.
Seems like they could have put those closer to the bed wall...

To the OP, i'd tuck them as far fwd and to the sides as possible keep clear of loads in the bed.. my 2cnts

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post #9 of 19 (permalink) Old 10-02-2019, 07:45 AM
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On my 2020, I installed a Retrax. Had the same issue - the plugs on the bed sides were too high.

I used the factory-drilled holes in the very front of bed that allow the bed to drain. But, the Retrax came with 1/2" hose - I bought some 1/2" - 3/8" barbed brass reducers from Lowes, and some 3/8" ID tubing. The smaller tubing fit without any issue through the factory holes, and it's actually snug enough that it grips the tubing and keeps it in place.

Initially I was going to drill as you're considering, but I'm glad I didn't.
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post #10 of 19 (permalink) Old 10-02-2019, 08:57 AM
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Quote:
Originally Posted by cdh7917 View Post
On my 2020, I installed a Retrax. Had the same issue - the plugs on the bed sides were too high.

I used the factory-drilled holes in the very front of bed that allow the bed to drain. But, the Retrax came with 1/2" hose - I bought some 1/2" - 3/8" barbed brass reducers from Lowes, and some 3/8" ID tubing. The smaller tubing fit without any issue through the factory holes, and it's actually snug enough that it grips the tubing and keeps it in place.

Initially I was going to drill as you're considering, but I'm glad I didn't.
Will the 3/8 tube od fit the 1/2" id hose tight enough that no fittings/reducers are required?

I was going to try it, but haven't yet got it done

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