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Black flexible rubber coupling with two stainless steel bands, tapered from larger to smaller end

Fernco Inc.

Fernco Inc. 1056-63 Flexible Coupling 6 in x 3 in trap

SKU CH-JMGD-20E1T MPN 1056-63

Flexible elastomeric PVC coupling joins 6 in and 3 in drain pipes, rated to 4.3 psi and 140 °F with 300 stainless steel bands

  • TypeDrain Components
  • MaterialElastomeric Polyvinyl Chloride
  • Flexible 6 in x 3 in connection fits mismatched pipes
  • Elastomeric PVC resists chemicals, fungus and normal sewer gases
  • 300 stainless steel bands maintain clamp strength under pressure
  • Rated to 4.3 psi and 140 °F for reliable drainage service
  • Meets ASTM C1173 standard for code-compliant installations

6 in x 3 in flexible coupling

The Fernco 1056-63 is a flexible elastomeric PVC coupling designed to join 6 inch and 3 inch drain pipes. It meets ASTM C1173 standards for drain, waste and vent applications. The coupling body measures 6 inches long with internal diameters of 6-39/64 inches and 3-25/64 inches. Two 300 stainless steel bands secure the connection against shear and settlement.

Suited for residential

Plumbers and contractors use this coupling to transition between dissimilar pipe sizes or materials in gravity-flow systems. The elastomeric PVC resists chemicals, fungus growth, normal sewer gases and ultraviolet exposure up to 140 degrees F. It is not intended for pressurised water supply lines or applications exceeding 4.3 psi. Buyers needing rigid solvent-weld fittings or higher pressure ratings should select a different product type.

Handles standard DWV transitions

The coupling comfortably seals typical gravity drainage flows and minor ground movement at the joint. Maximum working pressure is 4.3 psi, so it cannot serve pumped or pressurised circuits. Temperature resistance tops out at 140 degrees F, limiting use in high-temperature industrial discharge. The 300 stainless steel bands maintain clamping force in corrosive soils without requiring additional shielding.

Highlights

  • Flexible 6 in x 3 in connection fits mismatched pipes
  • Elastomeric PVC resists chemicals, fungus and normal sewer gases
  • 300 stainless steel bands maintain clamp strength under pressure
  • Rated to 4.3 psi and 140 °F for reliable drainage service
  • Meets ASTM C1173 standard for code-compliant installations

Specifications

TypeDrain Components
MaterialElastomeric Polyvinyl Chloride
BrandFernco
Model1056-63

Questions about this item

What pipe sizes must already be in place for the 6 in x 3 in coupling to connect them?

The coupling fits a 6 in pipe on one side and a 3 in pipe on the other, with inside diameters of 6-39/64 in and 3-25/64 in respectively.

Will the 300 stainless steel bands hold up against older cast-iron or clay pipe that stays in the ground?

The 300 stainless steel bands resist chemicals, fungus growth, normal sewer gases and ultraviolet rays, so they remain durable against existing pipe materials.

How can I confirm the joint is sealed to the 4.3 psi rating after installation?

Pressurise the line to the rated 4.3 psi and check for leaks; the elastomeric PVC body and stainless bands are designed to hold that pressure at up to 140 °F.

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