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Tools & Home Improvement > Building Supplies > HVAC > Furnace Parts & Accessories > Furnace Filters > B009P94NN2
  1. Dwyer Flex-Tube Series 1222 U-Tube Manometer, 4-0-4
    Image(s) provided for illustrative purposes and may differ from the actual product
  2. Dwyer Flex-Tube Series 1222 U-Tube Manometer, 4-0-4"WC using Red Gauge Fluid

    Delivery: 10-20 Working Days
    Customer Ratings (4 reviews)
    Sold Out / Out of Stock


This item may be available in a different size, colour, scent, version or platform. Click below to be directed to product options:

Product Description

  • U-tube manometer with red or green color concentrate measures positive, negative, and differential pressure for determining velocity and static pressures, leakage, fan and blower efficiency, filter resistance, and gas pressures
  • Columns composed of 1/8" outside diameter flexible and shatterproof clear butyrate tubing for use with water, red fluid, or mercury (sold separately)
  • Choice of calibration in inH2O or mmH2O using water for use with fluorescein green concentrate or mercury (sold separately), or red gauge fluid
  • Choice of measuring range with 1/10 inH2O (2mmH2O on metric units) graduations silkscreened in jet black on stark white scale to ease reading
  • Includes one bottle of red or green gauge fluid
Additional Information

Dwyer 1222 series Flex-Tube U-tube type manometer uses red gauge fluid, or mercury or green color concentrate to provide positive, negative, and differential pressure measurement for determining velocity and static pressures, leakage, fan and blower efficiency, filter resistance, and gas pressures. The columns are composed of 1/8" outside diameter flexible and shatterproof clear butyrate tubing for use with colored water, red fluid, or mercury (sold separately). The manometer is calibrated in inH2O or mmH2O using water and is available in W/M-style for use with fluorescein green concentrate or mercury (sold separately), or D-style for use with red gauge fluid. The water column has 1/10" divisions for inch scales or 2mm for metric units. Units are silkscreened in black on a white background to ease reading. The manometer has magnetic clips to mount on vertical surfaces and a clamp bar to prevent slipping. Magnets are removable to customize mounting. The manometer includes a bottle of fluorescein green or red gauge fluid.

Pressure typesStatic, vacuum, and differential
Media typeAir and gas
Wetted parts materialAcrylic plastic
Case materialVinyl tubing
ScaleInches of water, inches of mercury
Fluid typeRed or green gauge fluid, or mercury
MountMagnetic clips
Maximum pressure50psi, intermittently
Maximum vacuum20 inHg (10 inHg absolute), intermittently
Maximum temperature130 degrees F

H is height, the vertical distance from the lowest to highest point; W is width, the horizontal distance from left to right; D is depth, the horizontal distance from front to back.

Manometers measure the pressure of a liquid or gas. They are used in laboratory, medical equipment, engineering, automotive, and heating, ventilation, and air-conditioning applications. Manometers measure any combination of gauge, absolute, or differential pressures. Gauge pressure is the amount of pressure in a system relative to the ambient pressure, absolute pressure is the amount of pressure in a system relative to an absolute vacuum, and differential pressure is the difference between two pressures. Analog manometers are composed of columns of liquid, and they use gravity and the liquid's density to calculate pressure. Because they have no moving parts, analog manometers do not require re-calibration. Digital manometers have pressure sensors that are connected to a system with a hose to provide a digital readout of the amount of pressure present in a system. They use microprocessors to calculate pressure, and they require periodic calibration to help ensure accuracy.

Dwyer Instruments manufactures measurement and control instruments, including pressure gauges, flow meters, level instrumentation, temperature instrumentation, and air quality monitors. The company, founded in 1931, is headquartered in Michigan City, IN.

What's in the Box?

  • Dwyer 1222 U-tube manometer
  • Carrying plugs, one pair
  • Magnetic clips
  • Non-kinking vinyl tube connectors, one pair


Dwyer Instruments
Dwyer Instruments
Dwyer Instruments
4-0-4"WC using Red Gauge Fluid
Dwyer Instruments
Most Helpful Customer Reviews

After installing a new furnace, the installation manual stated that one of these tools were needed adjust the fuel control valve. Having never seen one of these, I made my choice based upon the number of Water Column inches I needed; 11 maximum, so this was perfect. I was shocked at how tall the item is, but then again, it is designed to measure the fluid inside the tube, and the gradients are real inch marks.

Seems like a well made instrument that I probably only need once in my lifetime, but it was worth the quality, and the money that I saved in calibrating the valve myself. My control valve required 1/4" hose, but this comes with 1/8" barbs. It is easy enough to buy a 1/8" id clear vinyl hose and a ribbed coupler where you can tie in a 1/4" clear vinyl hose.

If you can figure out how to use this tool, it is well made and sold at a good price.
Seems to work well and easy to use. The amount of fluid provided is a bit sparse, but otherwise a good purchase.
Please Note

The authorised South African distributor of this product is under no obligation to honour the manufacture's guarantees/warranties or to provide after-sales service.

Please note that this item is imported from the USA, and is designed to be used in the USA. In addition, if the unit is powered it will come with a US plug and an adapter/transformer may be required. Please click here for more information on power requirements, or check with us if you are unsure or need any assistance!

Please also note that certain items cannot be imported, these include Alcohol, Animals, Batteries, Flammable Materials, Currency, Food, Furs, Chemicals, Explosives, Medications, Plants, Seeds, Supplements, Pressurized Cans, Tactical Equipment, Vitamins, Weaponry and Weaponry Accessories. In these cases, the item and information is displayed for reference purposes only. If you are not sure if we are permitted to bring an item, please send us an e-mail with a link to the item to confirm.

Please also ensure that you are ordering the correct item for your particular application as returns to the USA are costly. Product reviews are also provided for most of our items, which can give you a good idea for possible things to look out for and the quality of the item. By clicking Add to Cart, you are confirming that the item is correct and you accept the conditions listed here.