4 inch Saddle Tee for Plastic or Cast Iron Drain Pipe

Fernco TST-4 PVC Sewer Saddle – 4" Tap for 6" to 15" CI, PL, or STL Main Lines

The Fernco TST-4 Sewer Saddle is a PVC saddle fitting engineered to provide a secure 4" branch connection to existing sewer mains ranging from 6" to 15" in diameter. Compatible with cast iron (CI), plastic (PL), and steel (STL) main lines, this fitting is designed for use in gravity flow systems. It incorporates a pre-formed EZtap inlet and stainless steel hardware for field installation without the need for pipe cutting or system shutdown.

The saddle is molded to contour to the host pipe and utilizes a flexible gasket seal to maintain watertight integrity. Stainless steel bands and mounting hardware are included to fasten the saddle in place, ensuring structural stability under backfill and long-term service loads.

Technical Specifications

• Product Type: Sewer Saddle with 4" tap
• Tap Connection: 4" PVC socket outlet with EZtap hole saw guide
• Main Pipe Compatibility: 6" to 15" nominal diameter – Cast Iron, Plastic, or Steel
• Body Material: Injection-molded PVC (conforms to ASTM D1784, Cell Class 12454)
• Clamping Components: Type 304 stainless steel bands and bolts
• Application: Gravity sewer and non-pressurized drainage systems

Installation Overview

The saddle is installed by drilling a 4" hole in the host pipe using a hole saw and guide. The saddle is then positioned over the opening and mechanically secured using the stainless steel straps and bolts. A solvent-weld PVC lateral pipe can be inserted into the socket outlet. All installations should comply with local plumbing and municipal code requirements.

Common Applications

• New sewer lateral connections to municipal or private mains
• Residential service line tie-ins
• Retrofitting lateral branches without removing existing pipe segments

Regulatory Compliance

Fernco sewer saddles are accepted for use by many municipal and utility jurisdictions. Always verify acceptance with the Authority Having Jurisdiction (AHJ) prior to installation.

Performance Summary

The Fernco TST-4 sewer saddle provides a reliable and field-adaptable method for tapping into sewer mains without disruption. Its molded construction, corrosion-resistant hardware, and mechanical sealing design make it suitable for long-term use in gravity sewer applications.