Is the LEGO Technic 5099-1 considered rare?

Yes, this piece is listed as a single item from the 1997 Technic theme, indicating rarity.

What is the theme and year of this valve?

This specific valve belongs to the Technic theme and was released in 1997.

The set number 5099-1 consists of only 1 piece.

Name: LEGO Pneumatic Valves (5099-1)
Brand: LEGO

Technic

Technic · 1997

Theme · TechnicPieces · 1Set Number · 5099-1Year · 1997

Used

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New / Sealed

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Is the LEGO Technic 5099-1 considered rare?: Yes, this piece is listed as a single item from the 1997 Technic theme, indicating rarity.
What is the theme and year of this valve?: This specific valve belongs to the Technic theme and was released in 1997.
How many pieces are in the set 5099-1?: The set number 5099-1 consists of only 1 piece.