![]() Or do I just seal the outside with duct seal? If the latter, then that means the rest of that tunnel is just empty. What type of sealant should you choose Thread sealants are available in either a tape or a pipe joint compound (often referred to as pipe dope). The suggested duplicate may be a solution, but if it is I need some clarification on whether I should be trying to get duct seal to completely fill that tunnel around the pipe. Step 1 Situation 1: Make Connections to Steel Gas Pipe If your old appliance is connected with a steel gas pipe and you’re installing a new appliance, buy a gas appliance connecting kit. ![]() Update: Based on the comments and suggested duplicate, I'll clarify that this pipe goes through a concrete tunnel at least 10 inches long. Note that this is already in place, so something like a sleeve that needs to be put in place at the time the line is run is not an option. So, I'm wondering is it OK to put expanding foam or caulking around that? Should I do just one or the other? Or should I pump foam deeper into the hole as thermal/ air insulation, and then after that's hardened, caulk around the outside for water seal? Or should I use some other product entirely? However, the sleeve stuff seems to be specific to underground penetrations through the wall? Googling this, I see a lot of mixed info - some ppl are saying expanding foam or caulk are OK, others are saying you MUST have a special sleeve. ![]() The gap is definitely large enough for insects to get through, and maybe small mice so I want to seal it up. It is used to lock and seal threaded parts and smooth. It is not sealed around the pipe on the outside. Gas Seal is an anaerobic single-component product with a mean mechanic unscrewing resistance. And the sad truth is, caulk or other types of sealants from home improvement shops cannot fill the gap. TridentSeal is easy to install and offers a permanent repair that is immediately guaranteed to perform upon passing a leak test. Though some homeowners always realize whenever they try to seal their gas lines, pests often return after a while. Designed to address the need for simple, instant, tamper-proof, live leak repair on gas piping, TridentSeal permanently seals active gas leaks 125 psi (8.6 bar) without interruption to service. I have a gas pipe that comes through my poured concrete foundation about 12 inches off the ground: Our college tutor told us when passing a gas pipe through a cavity wall to outside through a sleave you seal the end on the outside so any gas escape can be. /rebates/2fp2fRectorSeal-1-75-oz-5-Pipe-Thread-Sealant-257902f100144191&. You can seal around the gas pipe and different ways can help you to do so.
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