Also includes Dwyer A-605 Air Filter Kit for use with Magnehelic Gauges - 75$ (included for free)
Adapts any standard Magnehelic® for use as an air filter gauge. Includes aluminum surface mounting bracket with screws, two 5 ft. lengths of 1/4" aluminum tubing, two static pressure tips and two molded plastic vent valves, integral compression fittings on both tips and valves.