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Electrical Mast Connection Master Flash®

Specifically designed for the Residential Roofing Industry

The Electrical Mast Connection Master Flash® is a one piece flashing closed with stainless steel grippers

Modification Made Simple

Easy to see pipe diameters make for painless on-site installation.

Weather Protection Made of E.P.D.M.

These flashings are compounded specifically for maximum resistance to weathering due to ozone and ultraviolet light

Adaptable to Almost Any Roof Pitch

The built in 20° pitch allows adaptability to almost any roof pitch including 45°

ISO Quality, Price, & Availability / One Compound

Advanced Ozone Resistance tested to: EPDM
70 hour @ 500 pphm
High Temperature Resistance tested to: Intermittent: +135°C (+275°F)
Continuous: +100°C (+212°F)
Low Temperature Resistance tested to: -55°C (-67°)
Compression Set minimum… 25%


  1. Measure for correct pipe size
  2. Apply shingles up to lower edge of pipe
  3. Cut (EMC) flashing opening to appropriate size for you pipe
  4. Wrap (EMC) flashing around pipe and close by crimping on stainless steel grippers
  5. Apply sealant to the underside of (EMC)  base and secure base with roofing nails
  6. Apply sealant around the top of the (EMC) flashing where it meets the pipe, and along joiner seam
  7. Finish applying shingles over sides and upper portion of the (EMC) flashing

Note: Properly installed the lower approximately 1/3” (8.4mm) of the (EMC) base will be on the top of the shingles and the upper approximately 2/3; (16.9mm) of the (EMC) base will be covered by the shingles

Electrical Mast Connection

Pipe Size / Flashing Details Compound Part No.
Size 0” – 5-3/8” (0 – 136mm) • Base dimensions 15” (381mm) Black EPDM EMC


We treat all our customers like family and provide that personal touch.





8951 Yahweh Rd, Olive Branch, MS 38654
Toll Free: 800-274-2409 | Toll Free Fax: 800-876-6376
Master Flash®, Residential Master Flash®, and Retrofit® are registered trademarks of Aztec Washer Company.