Toilet Flange Repair Kit

SF-100 Fernco Closet Flange Repair Kit Spanner – Structural Support for Flange Reinforcement

The SF-100 Fernco Closet Flange Repair Kit Spanner is engineered to reinforce damaged or unstable toilet flange installations in retrofit or repair applications. It provides supplemental structural integrity for closet flanges that have deteriorated due to corrosion, misalignment, or previous installation failure.

This spanner ring is designed to be installed beneath the existing flange, providing a reinforced base for secure anchoring to the finished floor. The component supports proper bolt alignment and stabilizes the flange connection to prevent movement under fixture load, ensuring long-term mechanical integrity.

Component Features

• ✅ High-Strength Alloy Construction – Manufactured from corrosion-resistant galvanized or stainless steel for structural performance in wet environments.
• ✅ Universal Compatibility – Sized to interface with most 4" or 3" closet flanges (cast iron, PVC, or ABS).
• ✅ Low-Profile Design – Allows installation without affecting flange height, preserving wax ring compression and fixture sealing integrity.
• ✅ Field-Ready Configuration – Pre-slotted to accommodate closet bolts, minimizing the need for flange replacement in repair applications.

Technical Specifications

• Model: SF-100
• Material: Galvanized or stainless steel (verify variant)
• Application: Closet flange reinforcement or repair in floor-mounted toilet installations
• Dimensions: Compatible with most standard 3" or 4" flanges

Installation Notes

To install, position the spanner ring beneath the damaged or weakened flange and align the slots with the bolt holes. Secure the ring to the subfloor using appropriate fasteners. Confirm that the flange is level and that closet bolts are aligned prior to reinstalling the toilet. Use in accordance with applicable plumbing codes governing fixture support and flange alignment.

Typical Use Cases

Commonly applied in residential and multi-family unit bathroom remodels, especially where floor flange replacement is impractical. The SF-100 is also suitable for maintenance teams performing repairs in commercial restrooms where subfloor conditions or fixture movement has compromised flange stability.

Code and Application Consideration

Improper flange support can lead to fixture instability, wax ring failure, and wastewater leakage. The use of a structural spanner such as the SF-100 meets code intent by restoring load-bearing capacity to existing flange assemblies.