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The A.Y. McDonald line of 3” Diaphragm pumps features two stage, forty-four/one gear reduction with a large diameter output gear and heavy duty ball bearing construction. Often referred to as mud pumps or sludge pumps. A.Y. McDonald Diaphragm pumps are available with a choice of drivers to meet your application requirements: Briggs & Stratton or Honda gasoline engines, Hatz diesel or 115 VAC electric motor with weatherproof cord and switch. Built-in molded polyurethane flapper/check valve assures self-priming to 20 feet after initial prime. Heavy duty gear box is designed to operate pumps at 40 strokes per minute for electric motor and 60 strokes per minute for engine models. Each unit includes a 3” NPT steel suction strainer, two 3” NPT nipples, and a wheel kit with 10” semi-pneumatic transport wheels for portability. Suction and discharge port size cannot be reduced.
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