Installing a new water heater...

[Tasdau]

...and was wondering what these plastic inserts are? Should they come out before install? They are open except for that little tab in the middle.

Thanks in advance.


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[rocketflier]

They're to keep the water from contacting the nipple. You want to leave them in place, or replace the nipples with brass.

[Tasdau]

Ok. Thank you.