The ultimate pump for home winemaking use. Self-priming (will push air) so that it can draw out of a tank. Gentle diaphragm action so as to not "beat up" the wine. Made of food-grade, NSF approved, materials polypropylene and santoprene, so no metallic interaction with wine. Pumps 3 gallons per minute. Flow can be restricted with an inline valve positioned on the outflow side. Self-regulating motor is designed to temporarily shut down, and then turn back on, when restriction pressure exceeds pump capacity. Has a heat limitation of 125 degrees Fahrenheit so cannot be used in brewing applications. Pump is equipped with 1/2" Male NPT posts on the inlet and outlet.