3
well cap can be removed and replaced as necessary. For concrete weir boxes 4 Rawl
plugs are provided. Mark out the position for four bolt holes, (see Figure 1), and drill a
½ inch (12mm) diameter hole 2 inch (50mm) deep at each location. (The spacer bar
can be used to help locate the hole spacing properly). A 3/8 Rawl plug (four provided)
is installed in each hole, using the installation tool provided. The Rawl plug is first
placed in the hole and tapped flush with the surface. Then place the installation tool
inside the Rawl plug and set the anchor by means of several sharp hammer blows.
The PVC slotted tubing has a bottom plug at its lower end, which can now be
cemented in place using PVC cement. (It is left loose in case the PVC pipe needs to
be shortened a little due to space limitations). Use the four 3/8-16 bolts provided to
bolt the stilling well to the wall of the weir box using the pipe-strap and spacer bars.
Figure 1. Stilling -Well Supports.
