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Black flexible rubber coupling with stainless steel bands for six inch pipe connections

Fernco Inc.

Fernco Inc. 1056-66 Flexible Coupling 6 in x 6 in Trap

SKU CH-2GPG-3C58C MPN 1056-66

A flexible elastomeric PVC coupling joins two 6 in pipes and resists chemicals, fungus, sewer gases and UV rays up to 140 °F

  • TypeDrain Components
  • Fits 6-inch pipe with 6-39/64 in inside diameter
  • Meets ASTM C1173 standard for drain components
  • Withstands 4.3 psi pressure in sewer applications
  • 300 stainless steel bands resist corrosion and fungus
  • Operates up to 140 Degrees F in UV exposure

Purpose and Application

The Fernco 1056-66 flexible coupling joins two 6-inch pipes in drainage systems. It suits residential and commercial plumbing repairs where a watertight, flexible seal is required. The elastomeric PVC body accommodates slight misalignment and ground movement. This coupling is not intended for pressurised water supply lines or high-pressure applications.

Pressure, Temperature and Durability

The coupling withstands a maximum pressure of 4.3 psi and operates up to 140 degrees Fahrenheit. Its 300 stainless steel bands provide corrosion-resistant clamping force. The elastomeric PVC material resists chemicals, fungus growth, normal sewer gases and ultraviolet rays. These properties support long-term performance in buried or exposed drain installations.

Installation Fit and Requirements

The fitting length is 6 inches with an inside diameter of 6-39/64 inches. It conforms to ASTM C1173 for flexible pipe couplings. No special tools are required beyond a standard driver for the stainless steel bands. The coupling connects pipes of identical 6-inch nominal size and does not adapt differing diameters or materials without additional fittings.

Highlights

  • Fits 6-inch pipe with 6-39/64 in inside diameter
  • Meets ASTM C1173 standard for drain components
  • Withstands 4.3 psi pressure in sewer applications
  • 300 stainless steel bands resist corrosion and fungus
  • Operates up to 140 Degrees F in UV exposure

Specifications

TypeDrain Components
BrandFernco
Model1056-66

Questions about this item

How do I install the Fernco 1056-66 coupling and what step is often missed?

Slide the coupling over both 6 in pipe ends, center it, then tighten the 300 stainless steel bands evenly to seal the 6-39/64 in inside diameter. The step often missed is equal torque on both clamps to prevent offset leaks.

What maintenance or replacement will the Fernco 1056-66 coupling need later?

Inspect the elastomeric PVC body and 300 stainless steel bands annually for cracks, hardening, or corrosion. Replace the coupling if the material degrades from chemical exposure or exceeds the 140 Degrees F max temperature limit.

What limit appears first on the Fernco 1056-66 coupling under sustained use?

The 4.3 psi maximum pressure rating is the first limit reached under sustained load. Exceeding this pressure, or the 140 Degrees F temperature ceiling, will cause the elastomeric PVC to fail before the stainless bands.

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