What are these small plastic flaps on the WH water inlet & outlet?

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Old 08-02-20, 01:01 PM
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What are these small plastic flaps on the WH water inlet & outlet?




Small black plastic flaps on both cold and hot water tubes (deeper on the hot side). What are their functions? I kinda worry that this small flap may eventually fall off and BLOCK the water pipe somewhere. Should I remove those flaps to be safe?
 
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Old 08-02-20, 01:29 PM
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I've never noticed them on my tanks. But if they don't say to remove them then don't. Back flow prevention valves or flaps?
 
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Old 08-02-20, 01:36 PM
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NO, not the back flow prevention, because the flap go both ways.
 
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Old 08-02-20, 01:49 PM
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OK, did a bit of GOOGLING. Here's what I came up with:

the systems incorporate small metal elements called “nipples” — a small piece of piping with either a ball or flap sitting on the inside. You place the heat traps on the water inlet and outlet pipes. Here, they'll prevent heat from escaping due to convection.
Apparently this is fairly new and is considered very efficient.
 
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Old 08-02-20, 02:35 PM
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I honestly do NOT see how that little plastic thing can prevent heat loss. I worry more about that thing break down and block the water flow somewhere.
 
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Old 08-02-20, 04:41 PM
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Probably just the heat trap nipples many water heaters come with.
 
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