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Black flexible rubber reducing coupling with two stepped ends and stainless steel clamps

Fernco Inc.

Fernco Inc. 1056-42 Flexible Reducing Coupling

SKU CH-61MV-AQCG8 MPN 1056-42

Flexible reducing coupling joins 4-inch and 2-inch nominal pipe sizes with a 4-inch overall length

  • TypeDrain Components
  • MaterialHAWA
  • Connects 4 in and 2 in pipes with flexible reducing design
  • HAWA material resists corrosion for long drain system life
  • Female ends on both sides simplify installation without special tools
  • 4 in overall length fits standard drain component spacing
  • Model 1056-42 ensures correct replacement for specified plumbing repairs

Product Identity

The Fernco 1056-42 is a flexible reducing coupling designed to join a four inch nominal pipe to a two inch nominal pipe in drainage systems. It is manufactured from HAWA material and supplied in new condition for plumbing professionals and DIY installers.

Suitability

This coupling suits installers who need a transition between dissimilar pipe diameters in drain, waste or vent applications. It is not for buyers who require a straight coupling for equal pipe sizes or a fitting rated for pressurised water supply lines.

Deciding Specification

The defining detail is the nominal pipe size combination of four inches by two inches with female ends on both sides, which determines whether this part matches the pipe diameters on site.

Highlights

  • Connects 4 in and 2 in pipes with flexible reducing design
  • HAWA material resists corrosion for long drain system life
  • Female ends on both sides simplify installation without special tools
  • 4 in overall length fits standard drain component spacing
  • Model 1056-42 ensures correct replacement for specified plumbing repairs

Specifications

TypeDrain Components
MaterialHAWA
BrandFernco
Model1056-42

Questions about this item

What pipe sizes does the 1056-42 reducing coupling connect?

The 1056-42 connects a nominal 4 inch pipe to a nominal 2 inch pipe, accommodating outside diameters from approximately 4 inches up to 5 inches on the large end and 2 inches up to 3 inches on the small end.

How does the flexible coupling seal without glue or threads?

The coupling uses a flexible elastomer sleeve that slides over both pipe ends; stainless steel clamps are then tightened to compress the sleeve against each pipe, creating a watertight seal through friction and compression.

What clearance is needed to install the 1056-42 in a trench or wall cavity?

The coupling has an overall length of 4 inches, so you need at least that much straight run on each pipe plus room for a screwdriver or nut driver to tighten the two clamp bands.

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