Chemical selector valve has 3-way setting: off, prime, and chemical. Fits most Prochem, BLUEline, HydraMaster and Sapphire Scientific truck mount units.
2-10 GPH flow meter fits most truck mounts in the industry.
This check valve fits most Prochem stainless steel chemical pumps.
This O-ring goes on the check valve cap and seals the cap to the check valve. Measures 7/8" ID x 1 1/16" OD.