Aztec Washer Company RD901BE - Universal Master Flash Round Flashing - (7-3/4 in. - 19 in.)

The Aztec Washer RD901BA Extreme Angle Master Flash is the largest size in the Extreme Angle series, designed for oversized pipe penetrations on steep roofs with pitches from 35° to 65°. Manufactured from black EPDM, it offers excellent resistance to UV, ozone, and weathering while remaining flexible to absorb pipe movement. With its built-in 40° pitch and oversized trim-to-fit sleeve, it provides a watertight seal for pipes up to 19 inches in diameter. The wide 25-1/4 in base ensures a durable, secure installation.

Key Features:

• Black EPDM compound with superior UV, ozone, and weathering resistance.
• Built-in 40° pitch adapts to steep roof slopes (35°–65°).
• Oversized trim-to-fit sleeve accommodates pipes up to 19 inches.
• Large 25-1/4 in base provides a watertight and durable seal.

• Part number: RD901BA
• Material: Black EPDM
• Pipe range: 7-3/4 in to 19 in (197–483 mm)
• Base size: 25-1/4 in (641 mm)
• Application: Oversized pipe penetrations on steep slope metal roofs
• Temperature guidance: EPDM up to 212 °F (100 °C) continuous, 275 °F (135 °C) intermittent
• Warranty: 20 years (EPDM)

Q: What type of sealant should be used with RD901BA?
A: Use urethane or silicone sealant. Avoid petro-chemical-based sealants.

Q: What roof pitch is RD901BA designed for?
A: It is designed for steep roof slopes between 35° and 65°.

Q: What pipe sizes can RD901BA handle?
A: It fits pipe diameters from 7-3/4 in to 19 in (197–483 mm).

Q: Is RD901BA suitable for high-temperature applications?
A: EPDM is suitable up to 212 °F (100 °C). For hotter applications, silicone versions are recommended.