複数の同一名称の要素をまとめる：冠詞

Which is correct grammatically or otherwise?

1. The first and the second inflation tubes.

2. The first and second inflation tubes.

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The grammatically correct option is:

2. The first and second inflation tubes.

This is because when two or more items are listed together with a shared noun ("inflation tubes" in this case), the article "the" can be used just once before the first adjective ("first") and omitted before the second ("second").