Johnson Pump SPX Flow 1600 GPH Manual De Instrucciones página 19

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USE OF CHECK VALVE & PORT
The 1600 GPH and 2200 GPH pumps are equipped with 1 1/8" or 1 1/4"
barbed ports, while the 4000 GPH pump is equipped with 1 ½" or 2"
barbed ports. The port threads into the discharge area of the pump.
To install check valve, place washer into the discharge area of pump.
Next place the Nitrile flapper over the washer. Then thread port onto pump's
discharge. Tighten port until port is bottomed out with pump body.
NOTE: The check valve supplied with your pump is used to prevent the
backflow of water. The utilization of the check valve requires you to be
mindful of its functionality. The check valve material is made of Nitrile
material to be used for water applications only. Also, the check
valve will reduce the flow of the pump. If flow is critical to the application of
the pump, it is recommended that the check valve not be used.
Also, when winterizing your boat, remove the check valve to avoid ice
formation and/or degradation of the check valve.
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Original instructions