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Old 05-04-2021, 07:23 PM   #1
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Black Tank Cap "Rubber Seal" Lubricant

I am having a hard time getting the cap (cover) off the end of the drain pipe before dumping black tank. Is there a lubricant you can put on the black cap rubber seal so it will turn easier. I have one of those wrenches to twist the cap off, but thought a lubricant would help. I have a 2018 25' Coachmen Freelander motorhome. Thanks for your responses
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Old 05-05-2021, 11:16 AM   #2
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Unless you want a NSF rated o ring grease, use vaseline. NSF o ring grease Dow Corning 111
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Old 05-05-2021, 12:11 PM   #3
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Unless you want a NSF rated o ring grease, use vaseline. NSF o ring grease Dow Corning 111
jeff64 thanks for the reply. Looked up the Dow 111 on Amazon, a little expensive. I'll give the vaseline a go.
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Old 05-05-2021, 12:17 PM   #4
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Originally Posted by thepeddler View Post
I am having a hard time getting the cap (cover) off the end of the drain pipe before dumping black tank. Is there a lubricant you can put on the black cap rubber seal so it will turn easier. I have one of those wrenches to twist the cap off, but thought a lubricant would help. I have a 2018 25' Coachmen Freelander motorhome. Thanks for your responses
Are you sure youíve cleaned all the $#@& of the end of the pipe and cap?
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Old 05-05-2021, 12:19 PM   #5
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You can also get plumbers silicon grease for cheap in small tubes or cans. https://www.amazon.com/Waterproof-Si.../dp/B000DZFUPC
I have a small tub in every toolbox and vehicle. It will not degrade o-rings and other rubber items as vaseline will.
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Old 05-05-2021, 12:35 PM   #6
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You can also get plumbers silicon grease for cheap in small tubes or cans. https://www.amazon.com/Waterproof-Si.../dp/B000DZFUPC
I have a small tub in every toolbox and vehicle. It will not degrade o-rings and other rubber items as vaseline will.
NMWildcat, thanks. This forum is amazing. I will order
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Old 05-05-2021, 12:39 PM   #7
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Try one of these.

Not in stock at AMAZON.

Probably available elsewhere.

Good Luck.
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Old 05-05-2021, 01:21 PM   #8
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Vaseline and the handles above work wonders for all sewer line joints. Valterra make a cap with a full handle
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Old 05-05-2021, 02:25 PM   #9
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Vaseline and the handles above work wonders for all sewer line joints. Valterra make a cap with a full handle
Thanks Sticaly Amazon has it, may order just to have if I happen to lose my current cap; or just to have on hand. Looks like you can get a good grip on to remove.
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Old 05-05-2021, 02:27 PM   #10
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X2 on the plumber's grease:

https://www.homedepot.com/p/Oatey-1-...0620/203489444
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Old 05-05-2021, 02:27 PM   #11
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Originally Posted by U.S.ArmyVeteran View Post
Try one of these.

Not in stock at AMAZON.

Probably available elsewhere.

Good Luck.
Thanks, I have one of these, will try before ordering the Valterra with handle.
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Old 05-05-2021, 02:34 PM   #12
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Originally Posted by U.S.ArmyVeteran View Post
Try one of these.

Not in stock at AMAZON.

Probably available elsewhere.

Good Luck.
Quote:
Originally Posted by kenandterry View Post
Are you sure youíve cleaned all the $#@& of the end of the pipe and cap?
Thanks, yea I thought of this while reading all the posts. Will clean it an pipe up; But plan on buying the "plumbers silicone grease'
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Old 05-05-2021, 07:40 PM   #13
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I just use silicone spray for plastic. That said, I've never had trouble getting mine off, so maybe yours is defective.
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Old 05-05-2021, 07:47 PM   #14
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I just use silicone spray for plastic. That said, I've never had trouble getting mine off, so maybe yours is defective.
It's just hard to get off before draining the black and gray tanks. Like kenandterry said, maybe a good cleaning and then some silocon spray or plummers grease. BY THE WAY WHAT BRAND OF SILICON SPRAY DO YOU USE, AND WHERE IS IT AVAILABLE? Thanks thepeddler
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Old 05-05-2021, 09:01 PM   #15
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I like one called Something Better. It comes out as a foam, which makes it easier to work with. You can find silicone spray at any auto store or probably Walmart. They all work. You can also get silicone grease, which is what scuba divers use for their regulators because it will protect the rubber diaphram and o-rings.
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Old 05-05-2021, 10:58 PM   #16
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Cap

I take fine sandpaper and smooth the groove on cap. I also carry a slide wrench made for large diesel filters- like $12 off Amazon. My X TT the caps were low and under the slide, hard to get leverage. The filter wrench works great.
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Old 05-05-2021, 11:32 PM   #17
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Originally Posted by Tundra 2014 View Post
I take fine sandpaper and smooth the groove on cap. I also carry a slide wrench made for large diesel filters- like $12 off Amazon. My X TT the caps were low and under the slide, hard to get leverage. The filter wrench works great.
Yea, I donít think the problem is lubricant I think it is the locking pin and associated slot with a nipple on it. Not sure what to call it but when you twist it on you have to get the pin that is fixed on your drain pipe to lock behind the nipples that stick out in the groove. Iíve found if you take a file and just knock down the nipples a little bit it will twist on much easier.

Iíve never had an issue with the cap but I have with sewer hoses and that is what I did to eliminate the issue...
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Old 05-07-2021, 04:48 PM   #18
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Originally Posted by mnoland30 View Post
I like one called Something Better. It comes out as a foam, which makes it easier to work with. You can find silicone spray at any auto store or probably Walmart. They all work. You can also get silicone grease, which is what scuba divers use for their regulators because it will protect the rubber diaphram and o-rings.
Thanks, I saw this on one of the forums I read, not sure if it was FRF
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Old 05-07-2021, 04:54 PM   #19
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Yea, I donít think the problem is lubricant I think it is the locking pin and associated slot with a nipple on it. Not sure what to call it but when you twist it on you have to get the pin that is fixed on your drain pipe to lock behind the nipples that stick out in the groove. Iíve found if you take a file and just knock down the nipples a little bit it will twist on much easier.

Iíve never had an issue with the cap but I have with sewer hoses and that is what I did to eliminate the issue...
Thanks
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