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Stenner™ Single Head Pumps - Classic Series, SVP, BDF, and the M128 Series - are manufactured with a re-designed pump head with QuickPro™ technology. A pump with the QuickPro can be recognized by the latches, instead of screws on the pump head, or the serial number. The pump manufacture date is found in the serial number prefix on the pump or box label. Pumps with QuickPro pump heads have serial number prefixs with the date 050211 and later. Pumps with non-QuickPro pump heads have serial number prefix with the date 042911 or earlier.