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The Hamilton OR-7509 is the correct replacement for the following models of humidifiers:
The Hamilton Orifice for 10HF OR-7509 is the humidifier's orifice. This Hamilton orifice is designed to withstand pressures of 40-120 pounds per square inch. (psi) This orifice for Hamilton 10HF is made from quality, durable materials.
The Hamilton OR-7509 specifications: