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This is the correct top assembly replacement (Lasco 04-7175) for the Kohler 1B1-X Coast Brand ballcock. The Ace hardware 1B1-X top assembly did not fit the original Coast Brand ballcock.
Verified purchase: Yes | Condition: New
It must be re-machined in order to fit the toilet that it claims to fit.
Verified purchase: Yes | Condition: Pre-owned
Does not fit a 1B1X. Plunger hold diameter too small compared to OEM Kohler part
Verified purchase: Yes | Condition: New