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Features full adjustability through a top adjusting screw. The adjusting screw is turned clockwise for a higher setting and counterclockwise for a lower setting. Forged brass body, stainless steel valve seat and valve disc, stainless steel or rust-proofed steel pressure spring, and neoprene or bronze diaphragms. Adjustable spring range 2" to 30" mercury vacuum.
Spence Control Engineering Dist. - M & M Control