Cast bronze. Designed for easy installation and cleaning. Features mounting lugs cast into both sides to assure universal mounting, four outside tie rods and a 316 stainless steel strainer basket to minimize electrolysis. Hingled lugs for cast bronze cover permit easy removal and cleaning of basket. Drain plug in bottom casting is provided for easy removal of sediment and draining for winterization. Ratio given for open area to pipe size. Pipe 1/2" Size 5-3/4" H x 4-1/2" W Cylinder 3-1/2" x 4" Ratio 30:1