| 摘要 |
A plumbing device stores one or more additives, and allows injection and mixing of such additives into the water stream delivered to a plumbing fixture such as a shower head or faucet. The design of the passage for the water stream provides a pressure differential sufficient to draw the additive into the water stream, while check valves are used to prevent backflow of additives. A mixing chamber, with an impeller element, mixes the injected material with the water stream. Metering valves may be used to control the amount of additive dispensed.
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