3/4" x 3/4" 90 Degree, PEX Crimp Brass Elbow, Lead Free

5" x 4" Strong Back Shielded Reducing Coupling – For Clay-to-Cast Iron and Mixed Material Transitions

The 5" x 4" Strong Back Shielded Reducing Coupling is engineered to join dissimilar pipe materials with differing outside diameters—most commonly clay to cast iron, but also compatible with PVC, steel, and lead pipe configurations. The integrated shield design reinforces the connection, providing added structural support and resistance to shear forces, making it suitable for gravity-flow sanitary and storm sewer systems.

This coupling features a full stainless-steel shield and clamp assembly, designed to control and distribute clamping force evenly around the joint. It ensures a positive seal and maintains joint integrity under soil shifts, heavy loads, and expansion-contraction cycling common in buried installations.

Functional Advantages

• ✅ Shielded Design – Incorporates a 300-series stainless steel band to reduce joint movement and maintain alignment.
• ✅ Reduces Shear Stress – Strong back plates prevent pipe deflection at the connection point, ideal for installations subject to ground movement.
• ✅ Multiple Pipe Compatibility – Connects pipes of different materials and diameters while maintaining pressure-free flow conditions.
• ✅ Neoprene Sleeve – ASTM C564-compliant elastomer sleeve provides flexibility and a watertight seal.
• ✅ Torque-Control Clamps – Stainless steel clamps with pre-set torque values for consistent field performance.

Technical Specifications

• Size: 5" x 4" reducing configuration
• Materials: 300-series stainless steel shield and clamps; neoprene (elastomer) sleeve
• Connection Type: Shielded flexible coupling, reducer
• Standards: ASTM C1173, ASTM C564, CSA B602
• Application: Non-pressure systems (gravity drainage and sewer)

Installation Guidelines

Installation requires standard torque wrench tools to tighten stainless steel clamps to manufacturer-specified values (typically 60 in-lbs). Ensure that all pipe ends are clean, free of cracks, and properly aligned prior to seating the coupling. The shield should fully wrap around the joint to maintain structural reinforcement. Always verify compatibility with local code requirements and confirm dimensional matching between pipe OD and coupling size chart.

Use Cases

Frequently used in underground drainage, lateral line repairs, manhole connections, and building sewer tie-ins. The 5" x 4" reducing coupling is especially common during retrofit and rehabilitation work where existing clay mains are transitioned to cast iron or PVC for system upgrades.

Code Compliance Note

This coupling meets all applicable national standards for non-pressure drainage applications and is certified for use across multiple jurisdictions. Refer to local plumbing code for buried or structural reinforcement requirements.

Summary

The 5" x 4" Strong Back Shielded Reducing Coupling provides a reliable, code-compliant solution for joining unlike pipe materials with differential diameters. Its reinforced structure and elastomer seal ensure watertight, durable performance under challenging site conditions.