Dwyer 1221-M300-W/M Flex-Tube U-Tube Manometer


Out of stock



1221-M300-W/M U-tube manometer, range 150-0-150 mm w.c., 7.9 oz (225.5 g) mercury required to fill.

These inexpensive manometers measure positive, negative and differential pressures. Dwyer Flex-Tube U-Tube Manometers combine the inherent accuracy of the simple “U” Tube with the durability of tough, long-lasting plastic construction. Columns are of .375″ O.D. flexible and shatter proof clear butyrate tubing. They are easily accessible for cleaning.

Product Applications
1. Duct static pressure
2. Calibration labs
3. Filter monitoring


Minor Divisions of 1/10″ water column (or 2mm water column on metric units) are silkscreened in jet black on stark white scale for positive definition. Easy to read, even at a distance, they are acrylic coated for permanence. All models are furnished with one 3/4 ounce bottle of fluorescein green color concentrate with special wetting agent for W/M models, or 3/4 ounce bottle of red gage fluid for “D” units.
Series 1221 Manometer – Our simplest, lowest cost basic U-gage. A dependable U-tube manometer that withstands hard use and provides accurate, high visibility readings. For use with water, mercury or red gage fluid. For mercury filled manometers, a scale clamp bar, Dwyer Part No. A-363 (available as an extra for Series 1221 – and standard on Series 1222) is recommended. One pair of carrying plugs and a pair of non-kink vinyl tube connectors are included with each manometer.
Series 1222 Manometer – All the features of the 1221 plus magnetic clips for mounting to any vertical steel surface, and clamp bar to insure against U-tube slipping. (Especially recommended for manometers used with mercury.) Both magnets are easily removed and replaced at the user’s convenience.
Series 1223 Manometer – Our finest U-gage – for either portable or stationary use. Safety traps prevent loss of indicating fluid in case of accidental over-pressure.

Additional information

Weight 1 kg