Blue-WhiteIndustries F-40500LN-8 1.3cm Acrylic Flow Metre - 0.5 to 5 GPM

Blue-White FLOWMETER 0.5-5GPM 1/2IN F-40500LN-8

taylor Replacement Reagent Refill Kits - Basic Refill Kit - 2 oz.

Blue-White Flowmeter for 2 in. PVC Pipe, Horizontal Installation