• When connecting to a potable water supply follow all local codes for backflow prevention.
• For proper performance do NOT modify, substitute nozzle, hose diameter or length.
• Manufacturer assumes no liability for the use or misuse of this unit.
• Wear protective clothing, gloves and eye wear when working with chemicals.
• Always direct the discharge away from people and electrical devices.
• Follow the chemical manufacturer's safe handling instructions.
• NEVER mix chemicals without first consulting chemical manufacturer.

If you are connecting to a potable water supply follow all local codes for backflow prevention.

1. Mount the unit to a suitable surface above the chemical supply to prevent siphoning.
2. Connect hose(s) as shown in the diagram.
3. Flush any new plumbing of debris before connecting water.
4. Connect water supply. Install a water filter if water piping is older or has known contaminants.

TO SET DILUTION RATIO, thread a color-coded metering tip into each tip holder. See chemical labels for dilution ratio recommendation or consult your chemical supplier.

• For the strongest dilution ratio do NOT install a colored metering tip.
• The dilution ratios in the metering tip chart are based on water thin chemicals with a viscosity of 1CPS. Thicker chemicals will require a larger tip than the ratios shown in the chart.
• Chart shows ratios at 40 PSI water pressure. Actual water pressure is shown on unit gauge during operation. Adjust metering tip selection based on actual water pressure using the online Metering Tip Calculator or the math formula shown in the chart.
• Select and thread the tip color that is closest to your desired chemical strength into the tip holder.  DO NOT OVER-TIGHTEN
• Application results will ultimately determine final tip color selection.
• Push the chemical tubes over the tip holders and place the strainer in the chemical concentrate.
• If necessary, cut suction tube(s) to length.

If a leaner solution than the maximum shown in the chart is required, it will be necessary to use one proportioner to pre-dilute the concentrate, and a second to dilute the resulting solution to the required final ratio. If this Double Dilution procedure is required, choose two metering tips whose ratios, when multiplied together, result in a ratio that is as close as possible to the required final ratio. Example: For two "Bottle Fill" Mixing Station valves with 40 PSI water pressure, use a White Tip (37:1) and a Corn Yellow Tip (21:1) to achieve a final solution ratio of 777:1.

With the adjustable pressure regulator it is possible to "dial in" and achieve a specific dilution ratio.

• http://www.laffertyequipment.com/tools/metering-tip-calculator/
• Use the Metering Tip Calculator and enter a reference flow rate for your injector.
• Try entering different values for the actual water pressure until a metering tip shows the desired dilution ratio (make sure to stay within the pressure range of the water supply).
• Adjust the pressure regulator to this pressure and install the appropriate metering tip.  DO NOT OVER-TIGHTEN.
• Relative to the 40 PSI reference chart to the right: higher water pressure will weaken the concentration of the diluted solution, and lower water pressure will increase the concentration.
• If necessary, cut suction tube(s) to length before attaching suction strainer.

1. Hold the trigger gun, open the inlet ball valve, place the nozzle in the container to be filled. Pull the trigger and begin.
   
2. When container is filled to the desired level, release the trigger. Close the inlet ball valve and pull the trigger to relieve pressure in the hose.
3. Make final metering tip adjustments based on application results. Try the next larger or smaller sized metering tip until the results are acceptable.