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What do I do with the plastic "flapper" plugs inside the inlet and outlet nipples on my new waterheater, model 153.318132?

My assumption is that they come out because they would create a pressure drop through the water heater, however the design is so detailed, being made up of sleeves, orings, flapper valves etc, that it does not look like an ordinary cleanliness plug.

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2 Answers from these members:
afritz afritz
by afritz afritz Earned 36,384 community points in Appliances
December 31st, 2010
Answered in 6 minutes
0 votes
scott d
by scott d Earned 139,448 community points in Appliances
January 3rd, 2011
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