Consists of 3 parts. 1. Stainless cast mirror polished flange suits hole cut out size 160mm x 80mm. Has a unique return design which forces water down and away from freeing port or opening. Gate bar integral part of cast flange supports closure from water pressure when backing down. Mounting holes 4 x 6mm countersunk. 2. Urathane flap is molded and can be fitted flat one side for permanent seal or reversed for trickle deck release or drainage. 3. Urathane flap plate secures and sandwiches urathane flap to stainless cast. Price is each