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Square cast iron roof drain with yellow Duco-coated dome and flashing collar, 4 inch no-hub outlet

Jr Smith

Jr Smith 110-Y04 4" Cast Iron Roof Drain equipment

SKU CH-TTVP-MRCMV

A cast-iron roof drain with a 4-inch no-hub outlet, Duco-coated grate and flashing collar included

  • 4-inch cast iron construction for durable roof drainage
  • Duco-coated finish protects against corrosion
  • Square 8 3/4-inch design fits standard installations
  • No-hub connection simplifies pipe assembly
  • Includes dome, flashing collar and mounting screws

Jr Smith 110-Y04 4" Roof Drain

The Jr Smith 110-Y04 is a cast iron roof drain built for light commercial drainage systems. Its 4-inch no-hub connection fits standard vertical piping without additional adapters. The square top measures 8 3/4 inches across and includes a Duco-coated dome, flashing collar and mounting screws. Contractors handling flat-roof installations will find the dimensions match common curb openings.

Thermals noise and power draw

This drain has no moving parts, electrical supply or cooling requirements. It operates passively under gravity flow, so there is no fan noise, vibration or power consumption to consider. The Duco coating on the basin and dome resists corrosion from standing water and debris. Thermal expansion and contraction in the cast iron body follow normal material behaviour across seasonal temperature ranges.

Replaces older cast iron drains

The 110-Y04 serves as a direct replacement for worn or damaged 4-inch cast iron roof drains with a square top and no-hub outlet. The jump is worth it when the existing flange height, bolt pattern and dome clearance match the 11 3/4-inch overall height and 8 3/4-inch square footprint. Projects that need a different outlet size, round top or hub connection cannot use this model.

Highlights

  • 4-inch cast iron construction for durable roof drainage
  • Duco-coated finish protects against corrosion
  • Square 8 3/4-inch design fits standard installations
  • No-hub connection simplifies pipe assembly
  • Includes dome, flashing collar and mounting screws

Specifications

BrandSMITH LIGHT COMMERCIAL

Questions about this item

How do I install the 4-inch no-hub roof drain and what step is often missed?

Position the square cast-iron body over the roof opening, secure the included flashing collar with the supplied mounting screws, then connect the 4-inch no-hub outlet to the drainage pipe using a no-hub coupling; the step often missed is tightening the coupling bands to the manufacturer's specified torque.

What maintenance will the Duco-coated cast-iron drain need later?

Inspect the yellow Duco-coated grate and basin annually for coating damage, clear debris from the dome, and re-coat any exposed cast iron to prevent corrosion.

What limit appears first on the 11 3/4-inch high drain during sustained heavy rainfall?

The 4-inch no-hub outlet capacity becomes the limiting factor before the 11 3/4-inch overall height or 8 3/4-inch square basin overflows.

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