3½ in. Corrugated Fittings & Couplers

New! Released for 2026

TORRENTIAL RAIN™  3½” Fittings & Couplers

FDM’s TORRENTIAL RAIN™ Line

3½ in. 45 Degree Elbow

  • SMOOTH INTERIOR DESIGN

    improves flow rate and minimizes restrictions.

  • SPRING-LOADED CLIPS

    provide an exceptionally secure connection.

  • RIBBED EXTERIOR

    for superior strength.

  • INJECTION-MOLDED

    for consistent wall thickness.

  • EXTRA-HEAVY DUTY THICK WALL

    construction for long-term durability. Rated to last 200 – 500 years.

  • 100% VIRGIN HDPE

    contains no blown-in fillers or recycled material.

  • DURABLE YET FLEXIBLE

    can withstand ground shifting and settling that occurs with underground drainage.

  • WEATHERABILITY

    can withstand both extreme cold and extreme heat.

FDM’s TORRENTIAL RAIN™ Line

3½ in. 45 Degree Elbow

  • SMOOTH INTERIOR DESIGN

    improves flow rate and minimizes restrictions.

  • SPRING-LOADED CLIPS

    provide an exceptionally secure connection.

  • RIBBED EXTERIOR

    for superior strength.

  • INJECTION-MOLDED

    for consistent wall thickness.

  • EXTRA-HEAVY DUTY THICK WALL

    construction for long-term durability. Rated to last 200 – 500 years.

  • 100% VIRGIN HDPE

    contains no blown-in fillers or recycled material.

  • DURABLE YET FLEXIBLE

    can withstand ground shifting and settling that occurs with underground drainage.

  • WEATHERABILITY

    can withstand both extreme cold and extreme heat.

  • No Tools Required
  • Easy Click and Go Design Requires No Glue or Screws

  • Slim 5 in. Profile Easily Fits in Trench and Requires Less Digging

  • Adjust Height to Slope of Trench by Adding Stackable Risers

  • Large Sump Bottom Holds up to One Gallon of Sediment – Keeping Debris Out of Drain Line

  • Connects to Any Brand of 4 in. Corrugated Drain Pipe

  • 6 Pilot Holes for Optional Drilling to Leach Water into Subsoil

  • Superior Strength is Able to Withstand Any Climate

  • 100% HDPE – No Recycled Materials or Blown-in Fillers

  • 5-Year Money Back Guarantee Against Breakage

FDM’s TORRENTIAL RAIN™ Line

3½ in. 45 Degree Elbow

  • SMOOTH INTERIOR DESIGN

    improves flow rate and minimizes restrictions.

  • SPRING-LOADED CLIPS

    provide an exceptionally secure connection.

  • RIBBED EXTERIOR

    for superior strength.

  • INJECTION-MOLDED

    for consistent wall thickness.

  • EXTRA-HEAVY DUTY THICK WALL

    construction for long-term durability. Rated to last 200 – 500 years.

  • 100% VIRGIN HDPE

    contains no blown-in fillers or recycled material.

  • DURABLE YET FLEXIBLE

    can withstand ground shifting and settling that occurs with underground drainage.

  • WEATHERABILITY

    can withstand both extreme cold and extreme heat.

3½ in. Fittings and Couplers