What foam is used to seal underbody and wiring?

[MikeHoyt]

We have 2022 passport 221bh. Had to lower the underbody shield to trplace grey water valve handle and also removed some of the grey foam sealing that. What product is this grey foam

Related is seals for batteriy wiring from batteries on tongue to shunt and inverter in pass through. Thinking butyl tape and then also the same grey foam

Thanks
Mike hoyt

[chuckster57]

We use Great Stuff large gap expanding foam.

[dutchmensport]

Same: Great Stuff. Any expanding foam insulation will work though. I also used the original Liquid Nails on the under side of the camper to close holes up too. I know, it will never come off... never. That's why I used it.

[sourdough]

On the Great Stuff - they make that foam in varying formulations? that makes it expand more or less. Look at the areas you want to seal and buy accordingly. I picked up about 4 cans of it that expanded a LOT to fill small gaps in a shed I had built - that was a mess. It grew everywhere and I spent a lot of time then cutting off the excess. Now I keep cans of varying expansion laying around....somewhere.