Bronze. Mount the ring permanently. Fasten the strainer to the ring and remove as often as needed. NOT TO BE USED IN POTABLE WATER SYSTEMS. Available in 3 sizes: SC1000: 5 1/4" x 3 5/8" for 1" thru hull 6 3/4" x 4 7/10" for 1 1/2" thru hull 8 1/2" x 6" for max 2 1/2" thru hull.
