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home > GAF Master Flow Storm Collar, 4 in., 28 Gauge, Mill Finish (SMC4) > GAF Master Flow Storm Collar, 4 in., 28 Gauge, Mill Finish (SMC4)
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GAF Master Flow Storm Collar, 4 in., 28 Gauge, Mill Finish (SMC4)Master Flow 4 in. Storm Collar Adjustable Master Flow storm collar designed to seal around vent pipes penetrating the roof. Crafted in 28 gauge mill finish metal to help deflect rain, snow, and debris for reliable weather protection. Key Features: Adjustable Fit: Conforms to various roof pitches for a tight seal around pipes Weather Protection: Helps prevent rain, snow, and debris from entering at pipe penetrations Durable Construction: 28 gauge metal
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Master Flow 4 in. Storm Collar

Adjustable Master Flow storm collar designed to seal around vent pipes penetrating the roof. Crafted in 28-gauge mill-finish metal to help deflect rain, snow, and debris for reliable weather protection.


Key Features:

  • Adjustable Fit: Conforms to various roof pitches for a tight seal around pipes
  • Weather Protection: Helps prevent rain, snow, and debris from entering at pipe penetrations
  • Durable Construction: 28-gauge metal in mill finish for long-lasting performance
  • Easy Integration: Designed for 4 in. diameter vent pipes
  • Roof Flashing Compatibility: Pairs with roof flashings to complete a secure vent penetration

Specifications Table:

Specification Details
Brand GAF
Product Name MasterFlow Storm Collar
Model/Manufacturer Number SMC4
Product Number GAFSMC4
Diameter 4 in.
Thickness 28 Gauge
Finish/Color Mill Finish
Style Flashings
Unit of Measure Each
Pieces per Carton 6
Item Weight 0.8 lb
Intended Use For use around pipes penetrating roofs to protect against rain, snow, and debris
Adjustability Adjustable for various roof pitches

Frequently Asked Questions (FAQ):

Q: What pipe size does this storm collar fit?
A: It is designed for 4 in. diameter vent pipes.


Q: Is the collar adjustable for different roof pitches?
A: Yes, it is adjustable to accommodate various roof pitches.


Q: What material and thickness is it made from?
A: It is 28-gauge metal with a mill finish.


Q: How is it used with roof flashings?
A: Install it above the flashing around the pipe and tighten to create a weather-resistant seal.


Q: Is hardware included?
A: A tightening mechanism is integrated on the collar; additional sealant may be used per local codes and best practices.


Sleek Utility That Seals the Skyline

This streamlined storm collar brings a crisp, architectural edge to the most functional part of the roofline. Its mill-finish sheen frames the vent with quiet confidence while the adjustable band cinches neatly to any pitch. Pair it with complementary galvanized flashings for a cohesive, professional look that disappears into the silhouette. It’s a subtle, indispensable detail that elevates durability to a luxury standard.


Choose this Master Flow 4 in. storm collar for a clean, weather-tight pipe penetration that lasts.

GAF Master Flow Storm Collar, 4 in., 28 Gauge, Mill Finish (SMC4)

Item no : 73057433140
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US$ 10.33
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Min. order: 1piece

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