NEW! WDDP120 4" First Flush Advanced Downpipe Kit. Includes patented first flush plus tee and advanced release valve. First Flush Advanced protects your rainwater quality by diverting the first flush of the most contaminated water from your roof away from your rainwater tank. Kit includes: 1.First flush plush tee 2. ball seat 3. end coupling 4. pipe wall brackets x 2 5. sealing ball 6. transparent, rapid release exit funnel 7. advanced release valve 8. primary filter screen Requires 2x AAA Batteries - NOT INCLUDED-

• WDDP120 4” SCH40 Fits over 40” SCH40 pipe

1. Determine the length of 100mm (4”) pipe required for your first flush diversion chamber.
As a rough guide, 1 metre of 100mm (3ft of 4”) pipe holds approximately 8.8 litres
(2.3 gallons) of water. Ensure all cut edges are clean and smooth.
2. The First Flush Plus tee can be installed in the horizontal or vertical orientation to suit your
installation. The outlet and Advanced Release Valve must be accessible for maintenance
and inspection. (Refer to Figures 1a, 1b and 1c for suggested installation orientations).
100MM
• First Flush Plus tee
• Ball seat
• End coupling
• 2 100mm / 4” pipe wall brackets
• Sealing ball
• Transparent, Rapid Release Exit Funnel
• Advanced Release Valve
• Primary Filter Screen
• 100mm pipe (for diversion chamber)
• Tape measure
• Marker pen
• Saw
• Solvent weld glue
• Screws
• Drill or screwdriver
• 2 new 1.5 volt AAA batteries
• 2 100mmx90mm in pipe reducers
(for 90mm pipe installations)
WHAT’S IN THE BOX? TOOLS/MATERIALS YOU MAY REQUIRE
Figure 1
Suggested Installation Orientations
1a. Wet System or 'Charged' 1b. Vertical 1c. Horizontal
3. Select the orientation of the First Flush Plus tee appropriate for your chosen installation
point. This will determine which socket on the First Flush Plus tee will attach to your
diversion chamber. (Example: if you’re installing your First Flush Advanced into a horizontal
pipe, the arrow marking the direction of water flow should be oriented in the direction of
flow (see Figure 1c). For installations using the tee in vertical positions, always ensure the
arrow is pointed ‘up’ (see Figure 1a/1b).)
4. Orient the ball seat so it will fit inside the First Flush Plus tee socket that will attach to your
diversion chamber, then apply solvent weld glue and press it hard up inside the socket.
5. If you are attaching your First Flush Advanced to existing 90mm downpipes, install both
100x90mm socket in pipe reducer into the remaining First Flush Plus tee sockets. If you are
attaching your First Flush Advanced to existing 100mm downpipes, the reducers are not
required.
6. Measure your existing downpipe and cut to create space for the First Flush Plus tee. The
outlet of your diverter must sit at least 150mm (5.9”) from the ground when fully assembled,
so select your installation point and measure and cut accordingly. Ensure all cut edges are
clean and smooth. Install your First Flush Plus T-junction in place by applying solvent weld
glue to the sockets and pipe. Insert the pipe into the sockets or socket adaptors at either
end of the First Flush Plus tee.
7. Apply solvent weld glue to the end coupling socket and one end of your 100mm (4”)
diversion chamber pipe and insert it firmly into the end coupling.
8. Apply solvent weld glue to the socket of the ball seat and the other end of your 100mm
diversion chamber pipe then insert it firmly into the socket and against the ball seat.
9. Attach to the wall using the supplied brackets, supporting the unit until it is fully secured.
The upper bracket should sit directly under the First Flush Plus tee where it will hold the
weight of the unit.
10. Place the ball inside your first flush chamber through the end coupling. Install the Primary
Filter Screen, Transparent Rapid Release Exit Funnel, and Advanced Release Valve