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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

  • Product 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.

How it compares

Measured against everything we stock in Drain Stoppers, Strainers & Traps, at today’s prices. Recalculated every night.

Price $25.99
Cheaper than about 57% of the 4,240 comparable items (median $31.99).

Specifications

Product
Brand nameDayton
Model name4UN79
Product typeDrain Components

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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