Quick view Add to Cart Ducan Non-Return Flashing dek-master Non Return flashing is used to flash off the deck prior to installing dek-master vinyl. It sheds the water away from the edges of the deck to provide a waterproof area. MSRP: Was: Now: $10.16 (Inc. Tax) MSRP: Was: Now: $8.99 (Ex. Tax) Quick view Add to Cart