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That has nothing to do with your heating system. That is an old telephone jack box. If you move that cover in the Open direction, you should see it uncover a 4 wire telephone jack. The slot is to allow the wire to come out while you close it back. Here is one photo of a new one... I'll look for something better telephone jack


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Yes, these do fail. I have one almost identical to yours and have had to replace the cartridge a few times in 15 years.


3

That appears to be a damper (given the location I'd call it a "main" damper, as opposed to the ones for various smaller branch ducts) and having it "wide open" may be overloading your furnace fan motor, causing it to overheat and shut down. This involves one of the counterintuitive engineering principles that the internet has trouble with ...


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Perhaps excess acid flux was not wiped off. Vigorously wipe the area with a wet paper towel and see if the green deposits come off. If they don't, then rub with a terry cloth rag wetted with hot water. Probably the green will not return.


3

It may simply be condensation on a cold water line. The rule of thumb in plumbing is if the joint isn't leaking don't eff with it.


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This answer is based on the assumption that the pressure is not too high for polypipe with clips. You can add extra valves easily. By either cutting the pipe and adding a T piece, or by replacing existing T pieces with a Cross (X) piece. Clear away the dirt around the pipes, and try to wash the joints and pipes. Older polypipe is more likely to fail at the ...


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It looks like you have some "wiggle room" - the existing valves could be pushed closer together, though it might require rebuilding the manifold (branches off the supply line). My 7-zone system is indeed in a single rectangular box. For ease of identification, I would recommend (at least) labeling each zone valve and if at all possible, re-number ...


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What is on the other side of the wall? Sometimes it is easier to do the repair from behind especially if it drywall


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The fitting on the right side of the assembly in your picture is a union, it lets you make a threaded connection without spinning the whole assembly. It's not just handy, it's essential because it lets you make a threaded connection where you cut into an existing system or when you're making complex assemblies that can't be built by spinning the pieces on ...


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You might be looking for "Swivel adapters" if you mean connect to male pipe threads. Very common/handy for connecting PEX directly to faucet inputs, for instance If you mean garden hose threads (a faucet outlet for certain types of faucet) that would be a different item. It's not clear from the question what you mean, as it's not obvious what type ...


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That those are 1/4 turn or limited turn I would say they are washer-less valves. I would look around the outside of the body of the valve to see if there is a set screw / grub screw holding the cartridge in place, if you can not find a screw look closely at the brass hex piece that is cut out for the stop. Is that threaded on the outside if so it may unscrew ...


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