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UnderCover Flex Drain Tube Mod [FX41003]

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Old 02-08-2014, 04:39 PM   #1
Jooce [OP] Jooce is offline
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UnderCover Flex Drain Tube Mod [FX41003]

I recently purchased an UnderCover Flex model FX41003 for my 2013 DCLB and was slightly irritated with UnderCover's expectation that you would drill into your bed in order to accommodate the size of their drain tube.

I did some research on TW and found a thread that shows how to re-route the drain into a smaller plumbing barb using some poly elbows found at the hardware store. http://www.tacomaworld.com/forum/new...eau-cover.html It's not a bad write-up, but the pieces are not very distinguishable and the sizes used did not fit on my drain tube. So after a few trips to the local Home Depot and some trial and error, I found a simple solution to the problem. I decided to make a write-up for anyone else who is looking for a quick solution to their drain tube issue but does not want to drill into their bed. *DISCLAIMER: these instructions are written as simple as possible so I apologize if it is too "dumbed down" for some of you. I want to make sure anyone can do this without having to get a tutorial from their local hardware store employees.*

Step 1:
Determine the diameter of your drain tube. I purchased model FX41003 for my 2013 DCLB and the drain tube is 1/2" in diameter. If you don't know, you can always call UnderCover customer service and they will tell you over the phone. This will be the starting size for your drain tube adapter.

Step 2:
Buy the following plumbing parts at your local hardware store (I used Watts brand brass fittings as that is what was available):
  • - 1/4 in ID x 3/8 in MIP adapter (x2) [Watts item LFA-193]
  • - 3/8 in FIP coupling (x2) [Watts item LFA-760]
  • - 1/2 in ID x 3/8 in MIP adapter (x2) [Watts item LFA-385A]


ID stands for inside diameter. This is the size for the barbed ends of the fittings.
MIP stands for Male Iron Pipe thread. This is the threading on the outside of the fittings.
FIP stands for Female Iron Pipe thread. This is the threading on the inside of the fittings.

[Remember, this is based on a 1/2" tube. If your tube is a different diameter then the first adapter will be a different size (i.e. 3/8 in ID x 3/8 in MIP instead of 1/2 in ID x 3/8 in MIP). You can also use a size other than 3/8 as the coupling size, but it was the best option based on the stock at Home Depot.]

Step 3:
Assemble the three parts together so they look like this:


[The coupler pieces together the two barb fittings. You end up with 1/4" barb on one end and a 1/2" barb on the other, coupled together with a 3/8" coupler.]

Step 4:
Attach drain tube to the drain port on underside of rail:


Step 5:
Place the 1/4" end of the assembled plumbing adapter into the drain hole in the bed:


Step 6:
Measure out an approximate length to trim the drain tube. Make sure you have enough slack in the line to ensure it reaches far enough. You can always trim more if necessary, so be sure to err on the side of caution. (I measured mine to approximately the top of the coupler):


Step 7:
Trim the drain tube to desired length:


Step 8:
Remove plumbing adapter from the drain hole in the bed and attach to the drain tube. (Be sure to attach it all the way; the picture shows it partially attached for demonstrative purposes):


Step 9:
Place plumbing adapter back into the drain hole in the bed:


[It is not a "snug" fit, but you could always add some electrical tape or glue to the barb if you want to make it more secure.]

Step 10:
Repeat for the drain tube on the other side of the bed.

Done and done! All in all it cost me around $20. It would have been cheaper if I had used plastic/poly parts but I could not find them in the 1/2" diameter. I'm sure you could also do this with a few elbows as in the other write-up, but it seemed simpler to me to just make a straight adapter instead. I wish I had found a 1/2" ID x 1/4" ID barb fitting to just plug into the drain tube and drain hole, but I couldn't find one anywhere. Oh well. Hope this helps.

Jooce
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Old 02-08-2014, 04:55 PM   #2
Jooce [OP] Jooce is offline
Welcome to the layer cake, son.
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Wouldn't you know, after I go through the trouble of making my own adapter and posting a thread I find a reducer online that would probably work just as well. http://www.explosivepowersports.com/...ducers-33407w/

FML. Oh well, I feel accomplished nonetheless.
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Old 02-24-2014, 10:36 AM   #3
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For anyone looking for a stainless version, zoro tools has one at http://www.zorotools.com/g/00063741/k-G0988626/ . Pretty reasonably priced and good quality. Thanks for the tutorial Jooce.
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Old 02-24-2014, 11:59 AM   #4
Jooce [OP] Jooce is offline
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linuxbatm - wish I had known about that website before I hit Home Depot! Thanks for the link and the update.
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Old 02-24-2014, 12:22 PM   #5
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Thanks for the write up. I will have do try this for my backflip cover.
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Old 08-14-2014, 06:46 PM   #6
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Thanks for the write up. I just installed an Undercover Flex this evening. I was a little upset when I found that my Cargo Tie downs wouldn't work. Also, were you able to install with your front cargo rail installed? I had to remove mine. I may cut it shorter and reinstall it. Is that what you did?

Thanks,
Montauk17
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