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Step 1 — Position and mark the emergency overflow.
Step 2 — Pre-drill hole.
Step 3 — Cut out hole around the marking.
Step 4 — Diagonally cut PREFA outlet with bonding flange.
Step 5 — Roughen bonding points of leader head and emergency overflow.
Step 6 — Clean emergency overflow with PREFA adhesive remover.
Step 7 — Clean PREFA leader head with PREFA adhesive remover.
Step 8 — Apply PREFA special adhesive to flange.
Step 9 — Push PREFA outlet with bonding flange through hole from the inside (position outlet so that the longest side is at the bottom).
Step 10 — Remove any excess adhesive.
Step 11 — Finished PREFA leader head with emergency overflow.
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