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Old 02-26-2019, 03:48 PM   #1
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What is the black "sealant" around rubber LP gas line?

Does anyone know what sort of sealant they use around the rubber gas lines where it enters the water heater to connect to the burner fitting? It's black but not totally solid, but very difficult to remove. Looks like some sort of troweled on mastic more than a caulk. They used the same thing on our refrigerator LP line which is also rubber.

I need to drop these lines down so I can reinstall the trailer underbelly and I want to use the correct sealant on the lines when I put them back in place. I have failed to figure it out in google searches. It has a very aggressive bond to the appliance frame and the gas line (black rubber lines so I need to make sure the replacement is compatible with rubber). It's not the blown in black poly expansion foam like used in the underbelly.
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Old 02-26-2019, 04:01 PM   #2
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It's most likely either SikaFlex 221 or maybe 291 or it could be Geocel polyurethane, but I'm not positive of the number possibly GC66103.
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Old 02-26-2019, 04:01 PM   #3
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It's Black Insulating Foam. "Dow Great Stuff" - Available at Lowe's.
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Old 02-26-2019, 04:38 PM   #4
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What is the black "sealant" around rubber LP gas line?

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It's Black Insulating Foam. "Dow Great Stuff" - Available at Lowe's.
Thanks. I didn’t realize Lowe’s carries the black version. I only found the off-white stuff at Home Depot.

In this case, I am assuming he is referring to the soft rubbery caulk-type glossy sealant that is behind the door in the water heater
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Old 02-26-2019, 06:45 PM   #5
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No, the stuff I'm talking about is *NOT* "great stuff" foam. I'm familiar with that as it was used to tack down the underbelly sides and seal the pipe penetrations. This is something totally different.


So if it's likely a polyurethane sealant, I can just pick up some black poly sealant at the local big box store and use that? Or just use about any "caulk"?
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Old 02-27-2019, 01:39 PM   #6
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So if it's likely a polyurethane sealant, I can just pick up some black poly sealant at the local big box store and use that? Or just use about any "caulk"?
Yeah, you can pick up some sealant at most big box stores.
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Old 02-28-2019, 12:30 PM   #7
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If we are talking about the sealant around a penetration I suppose there are number of choices. If we're talking about where the propane line attaches to the Appliance I'm wondering why the joint wasn't just treated with the appropriate gas line grade of Teflon tape? Teflon tape is always my go-to guy am I missing something?
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Old 02-28-2019, 03:00 PM   #8
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dward51, if you can post a picture it will help a lot as I don't believe others are understanding what your talking about. I don't know what it is but like you said it is not a foam spray insulation. It's more like a plasticized rubber applied with a chalking gun.
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Old 02-28-2019, 03:34 PM   #9
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That sounds like butyl to me.
https://www.amazon.com/butyl-tape/s?k=butyl+tape
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Old 03-01-2019, 01:42 AM   #10
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This is a youtube video another FR forum member posted on his Girard tankless water heater install, but he shows the exact same sort of seal in his video at the bookmarked point in the video. I'm thinking it's a polyurethane sealant from the way it looks. If you push on it, there is a little give like it's flexible but it is solid not like butyl tape. Video should be cued at the correct point for him to talk about and show the sealant.

https://youtu.be/y_NjAkEi69A?t=297
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