3/4" Watts 9D-M2 Dual Check with Atmospheric Vent **Threaded Ends**

Item Number: 0061888
1 1
$252.01
Limited Stock (3)
Estimated transit time: 2 to 5 Business Days Eligible for Express Shipping

Brand - Watts
  • Valve Size: 3/4 inch
  • Weight: 19.1 lb
  • Body Material: Bronze
  • Maximum Operating Pressure: 175 PSI
  • Temperature Range: 33°F - 250°F
  • Connection Type: Female Union NPT Threaded
  • Installation: Vertical or Horizontal
  • Internal Parts: Stainless Steel
  • Approvals: ASSE 1012, CSA B64

Description

This 3/4 inch Watts 9D-M2 Dual Check Valve with Intermediate Atmospheric Vent prevents backflow of polluted hot or cold water into potable water supplies. Constructed with a durable bronze body, stainless steel internal parts, and two rubber check valves, it includes an integral strainer for debris protection. Designed for continuous pressure, non-health hazard applications in smaller supply lines like laboratory or dairy equipment and boiler feed lines. It features 3/4 inch NPT female union connections, operates from 33°F to 250°F, and handles pressures up to 175 PSI. The valve can be installed vertically or horizontally. Item number 0061888.

Help Me Connect

Connections

  • The female union inlet and outlet connections are 3/4 inch NPT threaded, designed to connect to 3/4 inch male NPT threads on your plumbing system.
  • Union fittings facilitate easier installation and removal for maintenance.
  • The drain connection is a 1/2 inch NPT thread.

Warranty Information

Watts (the "Company") warrants each product to be free from defects in material and workmanship under normal usage for a period of one year from the date of original shipment. In the event of such defects within the warranty period, the Company will, at its option, replace or recondition the product without charge. THE WARRANTY SET FORTH HEREIN IS GIVEN EXPRESSLY AND IS THE ONLY WARRANTY GIVEN BY THE COMPANY WITH RESPECT TO THE PRODUCT. THE COMPANY MAKES NO OTHER WARRANTIES, EXPRESS OR IMPLIED. THE COMPANY HEREBY SPECIFICALLY DISCLAIMS ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. The remedy described in the first paragraph of this warranty shall constitute the sole and exclusive remedy for breach of warranty, and the Company shall not be responsible for any incidental, special or consequential damages, including without limitation, lost profits or the cost of repairing or replacing other property which is damaged if this product does not work properly, other costs resulting from labor charges, delays, vandalism, negligence, fouling caused by foreign material, damage from adverse water conditions, chemical, or any other circumstances over which the Company has no control. This warranty shall be invalidated by any abuse, misuse, misapplication, improper installation or improper maintenance or alteration of the product Some States do not allow limitations on how long an implied warranty lasts, and some States do not allow the exclusion or limitation of incidental or consequential damages. Therefore the above limitations may not apply to you. This Limited Warranty gives you specific legal rights, and you may have other rights that vary from State to State. You should consult applicable state laws to determine your rights. SO FAR AS IS CONSISTENT WITH APPLICABLE STATE LAW, ANY IMPLIED WARRANTIES THAT MAY NOT BE DISCLAIMED, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE LIMITED IN DURATION TO ONE YEAR FROM THE DATE OF ORIGINAL SHIPMENT.
View full details

Additional Details

The Watts Series 9D 3/4" Dual Check Valve with Intermediate Atmospheric Vent prevents the reverse flow of hot or cold polluted water from entering potable water supplies. It is designed for continuous pressure, non-health hazard applications in smaller supply lines.

Primary Applications

  • Laboratory equipment
  • Processing tanks
  • Sterilizers
  • Dairy equipment
  • Boiler feed lines (to prevent backflow when supply pressure falls below system pressure)

Key Features and Construction

  • Bronze body with stainless steel internal parts and an integral strainer.
  • Two durable, tight-sealing rubber check valves. The primary check uses rubber-to-rubber seating, and the secondary check uses rubber-to-metal seating.
  • In the event of downstream check valve fouling, leakage is vented to atmosphere, safeguarding the potable water system.
  • Features union connections on inlet and outlet for ease of removal and maintenance.
  • Allows for maximum flow at low pressure drop.
  • Can be installed vertically or horizontally.
  • Compact design for economy and performance.
  • True line-sized construction allows check modules to open freely, reducing dirt and debris fouling.

WARNING: It is illegal to use this product in any plumbing system providing water for human consumption, such as drinking or dishwashing, in the United States. Always consult local water authority, building, and plumbing codes before installation. This valve should only be used and properly installed so that spillage of water could not cause damage. A drain pipe must be installed, terminating approximately 12" (305mm) above a floor drain or through an an air gap, and the vent opening or drain line must not be plugged.

Specifications

General

  • Product Type: Dual Check Valve with Atmospheric Vent
  • Brand: Watts
  • Model: 9D-M2
  • Valve Size: 3/4 inch
  • Body Material: Bronze
  • Internal Parts Material: Stainless Steel
  • Check Valve Material: Durable, Tight Seating Rubber
  • Connection Type: Female Union NPT Threaded
  • Drain Connection: 1/2 inch NPT Thread
  • Installation Orientation: Vertical or Horizontal

Performance

  • Temperature Range: 33°F - 250°F (0.5°C – 121°C)
  • Maximum Operating Pressure: 175 PSI (12.1 bar)
  • Minimum Required Pressure: 25 PSI (1.7 bar)
  • Application: Hot or Cold Water

Dimensions & Weight (Approximate)

  • Length (A): 4 1/2 inches (114 mm)
  • Height (B): 2 9/16 inches (65 mm)
  • Width (E): 1 15/16 inches (49 mm)
  • Width (E1): 2 9/16 inches (65 mm)
  • Weight: 1 3/4 lbs (0.79 kg)

Certificates & Approvals

  • ASSE 1012
  • CSA B64
  • N.Y.C. BSA 104-75-SM

FAQs

What is the primary purpose of the Watts 9D-M2 Dual Check Valve?

The primary purpose of this valve is to prevent the reverse flow of polluted hot or cold water from non-health hazard applications into the potable water supply, safeguarding drinking water systems.

What are the typical applications for this 3/4" dual check valve?

This valve is ideally suited for smaller supply lines in applications such as laboratory equipment, processing tanks, sterilizers, dairy equipment, and particularly for boiler feed lines where backflow prevention is critical.

What type of connections does the Watts 9D-M2 valve have?

The valve features 3/4 inch NPT female union inlet and outlet connections, which allow for easy installation and removal for maintenance. It also has a 1/2 inch NPT threaded drain connection.

What are the operating temperature and pressure limits for this valve?

This valve is designed for use with hot or cold water, operating within a temperature range of 33°F to 250°F (0.5°C – 121°C). It has a maximum operating pressure of 175 PSI and requires a minimum of 25 PSI.

Can this backflow preventer be installed in any orientation?

Yes, the Watts 9D-M2 Dual Check Valve can be installed either vertically or horizontally, providing flexibility for various plumbing configurations.