Rainstamp Aluminum Rectangular B Elbow 75 Degree, 2 in. x 3 in., 3 in. x 4 in. and 4 in. x 5 in., Multiple Colors - image 1

Rainstamp Aluminum Rectangular B Elbow 75 Degree, 2 in. x 3 in., 3 in. x 4 in. and 4 in. x 5 in., Multiple Colors

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Rainstamp Aluminum Rectangular B Elbow 75 Degree, 2 in. x 3 in., 3 in. x 4 in. and 4 in. x 5 in., Multiple Colors


The Rainstamp Aluminum Rectangular B Elbow turns a rectangular downspout 75 degrees, typically at the bottom of the run to direct water away from the wall. Corrugated aluminum with crimped sides, in 2 in. x 3 in., 3 in. x 4 in. and 4 in. x 5 in. sizes across many painted colors. Sold per piece.


Key Features:

  • 75 degree turn: B elbow geometry turns the downspout away from the wall at 75 degrees.
  • Three sizes: Available for 2 in. x 3 in., 3 in. x 4 in. and 4 in. x 5 in. downspout systems.
  • Corrugated build: Corrugated construction with crimped sides for a seamless appearance.
  • 0.0190 aluminum: Formed from 0.0190 aluminum alloy in the manufacturer's rectangular fitting line.
  • Color-matched options: 45 variants in painted colors plus Galvalume Plus and a Paint Grip Metallic finish.

Specifications Table:

Specification Details
Brand Rainstamp Manufacturing
Sell unit 1 piece
Product line Rectangular downspout fittings
Available colors 45 variants in painted aluminum colors (30 White, 80 White, Antique Ivory, Almond, Beaver Brown, Black, Buckskin Brown, Classic Cream, Colonial Blue, Colonial Gray, Colonial Red, Copper Metallic, Dove Gray, Dark Bronze, Forest Green, Heritage Cream, Herringbone, Light Bronze, Linen, Musket Brown, Paint Grip Metallic, Raffia Beige, Royal Brown, Rustic Copper, Tuxedo Gray, Wicker) plus Galvalume Plus
Available sizes 2 in. x 3 in. 75 degree; 3 in. x 4 in. 75 degree (26 GA Galvalume Plus variant); 4 in. x 5 in. 75 degree (26 GA Galvalume Plus variant)
Material 0.0190 aluminum alloy (per manufacturer's fitting line)
Angle 75 degree (B elbow)
Construction Corrugated with crimped sides
Intended use Direction change at rectangular downspout, typically at the bottom of the run

Coverage & How Much You Need:

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Fit and Compatibility:

Match the elbow to your downspout size (2 in. x 3 in., 3 in. x 4 in. or 4 in. x 5 in.) and pair with matching Rainstamp elbow offsets, A elbows and downspout lengths. The 4 in. x 5 in. size pairs with commercial-scale 4 in. x 5 in. downspouts.


Frequently Asked Questions (FAQ):

Q: What is a B elbow used for?
A: A B elbow turns the downspout sideways, most often at the bottom of the wall run to pitch water away from the foundation.


Q: What is included?
A: One elbow piece in your selected size, angle and color; downspout and sealant are sold separately.


Q: How do I pick the right size?
A: Measure your downspout face dimensions and choose the matching 2 in. x 3 in., 3 in. x 4 in. or 4 in. x 5 in. variant.


Q: What angle is this elbow?
A: 75 degrees, the standard B-elbow angle for rectangular downspouts.


Q: Does it match my gutter color?
A: Yes, there are 45 color variants; select the color code that matches your gutter and downspout.


Expert Verdict — Reviewed by the SuperArbor Pro Desk

Pair this B elbow with an offset fitting on the wall run: the offset shifts the downspout tight to the wall and the B elbow kicks the discharge away at grade. Orient the corrugated crimp so water flows into the seam, not out of it, and keep the bottom elbow's discharge aimed toward a splash block or drain line. For 4 in. x 5 in. commercial downspouts, note the 26 GA Galvalume Plus option for extra wall thickness.

Downspout fitting edges are sharp; wear cut-resistant gloves and eye protection when handling and cutting metal fittings.


Order the Rainstamp Rectangular B Elbow to turn your downspout discharge away from the foundation.

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Subject to Approval & Availability
All orders are reviewed before fulfillment. You are not charged until your order is approved and ready to ship — and you may cancel at any time before that at no cost.

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