supply tubes must be mounted along the concrete surface and towards the
box. Fix the tubes to the same reinforcement as the box (here steel
thread can be used).
mm holes for the tubes is punched in the weakened areas in the side of
the box (flat areas). Push the supply tubes inside the box and adjust
the length so that the hose is lying on the concrete as mentioned above.
The box is then pushed on to the spring.
length of the supply tubes should be 15-25 cm, inside the box. The
tubes is then formed in a circle along the edge of the box. Put
the lid on.
the pictures indicates, the different sections of the hose can be
numbered and marked inside the box.
some places the spring can be dropped and the lid or the box can be
nailed directly to the form.