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Old 04-13-2016, 08:21 PM   #1
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What is this?

A red plastic item found in the hot water heater compartment when de-winterizeing. It seems to fit in the out flow portion of the pressure relief valve. However, it doesn't seem to feel any purpose and doesn't want to stay in there.

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Old 04-13-2016, 08:27 PM   #2
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That is the cap that the valve is shipped with to keep debris out of it before installation they must of failed to discard it


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Old 04-13-2016, 08:30 PM   #3
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Looks like an FME (Foreign Material Exclusion) plug. Fills the the water connection holes in the water heater until they're ready to screw in the fittings. Keeps crap out of the water heater until it's installed. You can throw it away.

They come in all types and sizes. See here:
https://www.google.com/search?q=prot...xTrxs0AzUwM%3A
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Old 04-13-2016, 10:39 PM   #4
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Quote:
Originally Posted by egladden View Post
That is the cap that the valve is shipped with to keep debris out of it before installation they must of failed to discard it
Quote:
Originally Posted by rockfordroo View Post
Looks like an FME (Foreign Material Exclusion) plug. Fills the the water connection holes in the water heater until they're ready to screw in the fittings. Keeps crap out of the water heater until it's installed. You can throw it away.
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Old 04-13-2016, 10:44 PM   #5
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Yep, just a thread protector, just removed one from my relief valve and chucked it.
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Old 04-14-2016, 04:21 AM   #6
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Agreed, thread protector from the relief valve, mine is still in there, just toss it.

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Old 04-14-2016, 06:52 AM   #7
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Years ago I had a new Ford F150 and I wanted to change the transmission fluid. All went well but I found this plug looking thing in the bottom of the transmission pan. I thought it must have fallen out some where so I looked and looked. I could not find any place it would seem to go, so I just put the pan back on, filled it with fluid and all was well. I held on to that plug thinking any day my transmission would just give up on me because that part was missing. Well, a year or so later I found out that Ford uses that at the bottom of the dip stick tube because the units are filled with fluid and then assembled upside down. They then insert the dip stick which pushes out this plug. The plug just sets in the bottom of the pan until someone like me finds it.
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Old 04-14-2016, 05:33 PM   #8
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Well, this red thing is open at both ends, so it might protect the threads but wouldn't keep stray material out!


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Old 04-14-2016, 08:06 PM   #9
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Quote:
Originally Posted by MNtraveler View Post
Well, this red thing is open at both ends, so it might protect the threads but wouldn't keep stray material out!

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If you look at my link in Post #3, you'll see there are hundreds of types/sizes/colors of these things. There are some to keep the threads protected (for a piece of pipe that you can look through and check for foreign material, for example) and some to keep stuff out (and maybe protect threads, too).
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Old 04-18-2016, 05:13 AM   #10
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Quote:
Originally Posted by MNtraveler View Post
Well, this red thing is open at both ends, so it might protect the threads but wouldn't keep stray material out!

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The red one is just to protect threads...

Quote:
Originally Posted by rockfordroo View Post
If you look at my link in Post #3, you'll see there are hundreds of types/sizes/colors of these things. There are some to keep the threads protected (for a piece of pipe that you can look through and check for foreign material, for example) and some to keep stuff out (and maybe protect threads, too).
I work in industrial construction, you will see these things by the thousands when the pre-assembled process piping comes in. Those are typically full covers/plugs to protect the interiors of the piping from debris and the threads from damage.

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Old 04-18-2016, 05:21 PM   #11
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