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Bronze press-fit coupling with MNPT thread, straight union shape

Viega

Viega 79740 Bronze Press-Fit 1 in MNPT 1 in Coupling

SKU CH-MQDV-6Y5S7

Bronze press-fit to MNPT straight union for 1 in copper tube, rated 200 psi at 250 °F with EPDM seal

  • Press-fit copper connection installs fast without flame
  • Bronze body resists corrosion in potable water systems
  • EPDM O-ring seals up to 200 psi and 250 Degrees F
  • Straight union joins 1 in press-fit to 1 in MNPT threads
  • Meets ASTM B75 and ASTM B88 standards for quality

Viega Bronze Press-Fit Coupling

The Viega 79740 is a straight bronze union that joins a 1 in press-fit copper tube to a 1 in male NPT thread. It is designed for potable water systems and carries ASTM B75 and ASTM B88 compliance for material quality. The EPDM O-ring provides the seal when the press connection is made with the correct tool.

Check pipe size and press tool access

Verify that the copper tube is exactly 1 in CTS and that the mating component has a 1 in male NPT thread. Ensure there is enough straight pipe length and clearance for the press jaws to complete the crimp without obstruction. Confirm the system design pressure and temperature stay within the 200 psi and 250 Degrees F limits stated for this fitting.

Suits potable water press installations

This coupling suits installers who need a press-to-thread transition in copper potable water piping. It is not for gas lines, compressed air systems, or applications that exceed the listed pressure or temperature ratings. Buyers without a compatible press tool or who require a different end connection type should look at other fitting styles.

Highlights

  • Press-fit copper connection installs fast without flame
  • Bronze body resists corrosion in potable water systems
  • EPDM O-ring seals up to 200 psi and 250 Degrees F
  • Straight union joins 1 in press-fit to 1 in MNPT threads
  • Meets ASTM B75 and ASTM B88 standards for quality

Specifications

BrandViega

Questions about this item

Does the 79740 coupling include the EPDM O-ring or must it be ordered separately?

The fitting ships with the EPDM O-ring already installed on the press-fit end so no separate seal is required.

When should I choose the 1 in press-to-MNPT straight union over other Viega configurations?

Select this 79740 model when joining 1 in copper tubing to a 1 in male NPT thread in a straight run for potable water.

What does the 200 psi rating mean once the coupling is pressed onto 1 in copper tube?

The joint is rated for 200 psi maximum operating pressure at up to 250 °F in potable water systems.

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