DescriptionRKI 21-1898RK is Suitable for the sensor chamber and RP-2009 pump.What's included with the RKI 21-1898RK RKI 21-1898RK Sensor Adapter Assembly
DescriptionRKI 21-1832RK is Replacement part or accessory for the RP-6 pump.What's included with the RKI 21-1832RK RKI 21-1832RK Filter Holder, clear plastic