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Dayton 4UN79 slip union TPR check valve trap, inline spring swing mechanism, vertical mount

Dayton

Dayton 4UN79 Slip Union TPR Check Valve Trap

SKU CH-7TCN-JS1X1 MPN 4UN79

A check valve with inline spring-swing mechanism and TPR body for 1-1/4 in or 1-1/2 in slip connections, vertical mounting

  • TypeDrain Components
  • Inline spring-swing mechanism ensures reliable backflow prevention
  • TPR body material resists corrosion for long service life
  • Slip-union connection fits 1-1/4 in or 1-1/2 in pipe without tools
  • Vertical mounting orientation simplifies installation in drain lines
  • General-purpose design suits a wide range of plumbing applications

Slip Union Check Valve for Drains

The Dayton 4UN79 is an inline spring swing check valve built from TPR for general-purpose drain lines. It accepts 1-1/4 inch or 1-1/2 inch pipe through slip-by-slip connections and installs in a vertical orientation. The mechanism prevents backflow while allowing standard drainage flow.

Suited for Vertical Drain Applications

This valve fits installers who need a corrosion-resistant check valve for vertical drain piping in the specified sizes. It is not rated for steam pressure, so engineers specifying steam systems should select a rated alternative. Buyers requiring a horizontal mounting orientation or a different connection type will need a different valve.

Integrates Into Standard Drain Builds

The slip-union ends join directly to matching drain pipe without threading tools or solvent cement, simplifying assembly and future disassembly. Vertical mounting keeps the spring-loaded swing mechanism aligned for reliable sealing. The TPR body handles typical drain fluids without the weight or cost of metal alternatives.

Highlights

  • Inline spring-swing mechanism ensures reliable backflow prevention
  • TPR body material resists corrosion for long service life
  • Slip-union connection fits 1-1/4 in or 1-1/2 in pipe without tools
  • Vertical mounting orientation simplifies installation in drain lines
  • General-purpose design suits a wide range of plumbing applications

Specifications

TypeDrain Components
BrandDayton
Model4UN79

Questions about this item

What size slip-joint pipe must already be in place for the 4UN79 to connect?

The valve accepts 1-1/4 in or 1-1/2 in slip connections, so existing pipe must match one of those diameters.

Will the inline spring-swing mechanism operate correctly if the trap is installed horizontally on an older drain line?

No, the valve is rated for vertical mounting only; horizontal orientation will prevent proper check-valve function.

How can I confirm the TPR check valve is sealing after installation?

Run water through the line and verify no back-flow occurs when the flow stops; the spring-loaded swing should close silently.

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