P100-C2-5 - Z100 8" x 2" Cast Iron Roof DrainZurn's underdeck clamp is manufactured from durable cast iron and provides the ability to top mount a roof drain for outlet sizes 2" to 5" Durable construction stands up to tough environments Part Repair Part Underdeck Clamp with Parts Bag Only Design accommodates new construction and retrofit applications System accessories available including aluminum dome strainer, underdeck clamp, vandal proof screws and roof sump receiver 1 year limited warranty