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Bronze ProPress straight adapter with EPDM seal, 1 inch FTG by MNPT, model 79405

Viega

Viega 79405 ProPress straight adapter 1 in FTG x MNPT bronze EPDM 200 psi 250 °F

SKU CH-NKRN-MPY2S MPN 79405

Straight bronze adapter connects 1 in FTG to 1 in MNPT with EPDM seal, rated 200 psi and 250 °F

  • TypeDrain Components
  • ProPress press connection installs without flame
  • Bronze body handles 200 psi and 250 °F
  • EPDM O-ring seals potable water systems
  • Straight adapter joins 1 in FTG to 1 in MNPT
  • Compact 2 7/32 in length fits tight spaces

Viega ProPress straight adapter

The Viega 79405 is a bronze crimp adapter fitting designed for potable water systems. It connects a 1 in copper tube on the FTG side to a 1 in male NPT thread on the MNPT side. The EPDM O-ring provides a secure seal without soldering or threading tools. This new fitting suits plumbers and facility managers pressing copper pipe in commercial or residential installations.

Bronze body with FTG and MNPT ends

The straight adapter uses a bronze construction rated for 200 psi maximum operating pressure. Side A accepts 1 in copper tube for a ProPress crimp connection while Side B offers a 1 in male NPT thread for threaded components. The EPDM O-ring material resists chlorine and chloramine in potable water. Overall length measures 2 7/32 in, allowing compact routing in tight mechanical rooms or service chases.

Rated for 250 °F and 200 psi

Normal operation stays within a maximum temperature of 250 °F and a pressure ceiling of 200 psi. The bronze body and EPDM seal maintain integrity under these conditions without degradation. No external power or moving parts are involved, so noise and thermal output are not applicable. Installers should verify that system design does not exceed the stated pressure and temperature limits.

Highlights

  • ProPress press connection installs without flame
  • Bronze body handles 200 psi and 250 °F
  • EPDM O-ring seals potable water systems
  • Straight adapter joins 1 in FTG to 1 in MNPT
  • Compact 2 7/32 in length fits tight spaces

Specifications

TypeDrain Components
BrandViega
Model79405

Questions about this item

What pressure and temperature limits does the ProPress straight adapter rated 200 psi and 250 °F cap in practice?

The bronze EPDM fitting is rated for a maximum operating pressure of 200 psi and a maximum operating temperature of 250 °F.

What pipe sizes and connection types must match for the 1 in FTG x MNPT straight adapter to fit?

It connects a 1 in copper tube size on the FTG side to a 1 in male NPT thread on the other side.

How is the 79405 ProPress adapter installed, and what step do installers often miss?

Clean the tube end, insert fully into the FTG socket until it stops, then press with a compatible ProPress tool; skipping the full-depth insertion causes leaks.

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