4X3 FF CF W/KO W/SS RING

4 x 3 FF CF W/KO W/SS RING is a 4" x 3" cast iron reducing floor flange fitting used in drainage/vent piping systems.

🔧 What it is

• Size: 4" x 3"
• Type: FF = Floor Flange (closet flange style)
• Material: CF = Cast Iron
• Features:
  • W/KO = With Knockout (removable test plug)
  • W/SS RING = With Stainless Steel ring (reinforcement sleeve)

⚙️ What it does

• Connects a 4" drain pipe to a 3" outlet reduction
• Provides a secure mounting point for a toilet or floor fixture
• The knockout allows:
  • Temporary sealing during testing
  • Easy transition to final installation

🧱 Key features

• Heavy-duty cast iron construction
• Stainless steel reinforcement ring for strength and corrosion resistance
• Knockout plug for pressure testing or temporary sealing
• Bolts to floor or subfloor for rigid fixture support

🏗️ Typical applications

• Toilet closet flange installations
• Commercial restroom rough-ins
• Floor drain or waste stack connections
• Plumbing DWV (Drain, Waste, Vent) systems

🧠 Simple explanation

It’s basically a heavy-duty cast iron toilet flange that reduces from 4-inch pipe to 3-inch, with a test plug and stainless reinforcement ring for strength.