This product is made up of materials that are harmless to humans, including pistons, an O-ring and cooper pipe. Because the air layer is completely separated from the water with the presence of O-ring, it guarantees a semi-permanent life span. It is made in compliance with PDI (Plumbing and Drainage Institute) standard, that is FU (Fixture Unit) definition and each model is proven to have a volume appropriateness and reliability through 200,000 cycle tests.

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