The Deck-Mate flashing incorporates a stepped profile which creates a compression seal between the schedule 40 piping and the flashing. Deck-Mates are designed with proper reinforcing ribs to allow the flashing to maintain rigidity and the shape of the product. By combining the stepped profile and the reinforcing ribs, the product will properly accommodate the use of a stainless steel clamp. The clamp is crucial in maintaining a water-tight seal for years to come.