Fernco - 4" X 4" Cast Iron/Plastic Flexible Coupling

Fernco Flexible Couplings provide reliable, leak-proof connections for a variety of pipe materials and sizes in both residential and commercial plumbing and irrigation systems. Trusted by contractors and municipalities, these couplings simplify installations, repairs, and retrofits for drain, waste, and vent lines—even in challenging underground applications.

Key Features:

• Made from tough elastomeric polyvinyl chloride (PVC) for strength and flexibility
• Resistant to chemicals, UV rays, fungus, and normal sewer gases
• Leak-proof and root-proof performance helps prevent infiltration and exfiltration
• Installs quickly without special tools—ideal for tight deadlines
• Connects same or different pipe sizes and materials
• Used for in-house and sewer connections, lateral repairs, and transitions

Construction & Durability:

• Constructed from flexible PVC to accommodate movement, vibration, and slight pipe misalignment
• Stainless steel clamps provide secure sealing under all conditions
• Unaffected by soil conditions and extreme weather

Performance & Functionality:

• Designed for use with sewer, drain, waste, and vent piping
• Withstands soil pressure, heavy earth loads, and normal structural movement
• Maximum pressure test rating: 4.3 PSI (29.6 kPa)
• Creates positive seals that resist roots, gas, and water leakage

Ease of Installation & Use:

• Simple three-step installation: slide over pipe, align, tighten clamps
• No glue, solvent welding, or special tools required
• Flexible design allows coupling at cut-in points or lateral pipe connections
• Torque specifications: tighten clamps to 60 inch-lbs

Technical Specifications:

• Material: Elastomeric PVC (flexible)
• Clamp Material: Stainless Steel
• Test Pressure: Max 4.3 PSI (29.6 KPA)
• Temperature Range: Rated for typical sewer and drain conditions
• Resistant to: Soil movement, chemicals, UV exposure, and fungus
• Leak and root proof: Yes
• Application Type: Underground and above-ground
• Install Torque: 60 in-lbs

Installation & Application:

• Recommended Uses: Residential, commercial buildings, sewer systems, irrigation, and utility work
• Installation Method: In-ground or above-ground—slides over pipe ends and clamps down
• Compatible with: Clay, cast iron, plastic, steel, copper, and other common pipe materials
• Ideal for pipe repairs, cut-ins, and transitions between dissimilar pipe sizes

Compatibility & Optional Accessories:

• Compatible with Fernco Proflex couplings (shielded for above-ground applications)
• Works with Fernco Strong Back RC shielded couplings for high-load applications
• Can be used alongside Fernco transition couplings and caps