Aztec Washer Company RF301BP - Retrofit Master Flash (9-1/2" - 17")

Aztec Washer RF301BP is a size #3 standard retrofit flashing for large-diameter pipes and conduits where a slide-over boot won’t fit. The split, wraparound design closes with included snap-on fasteners, creating a compression seal around the pipe. Molded from UV- and ozone-resistant black EPDM, it trims cleanly on site and conforms to common metal roof panel profiles and roof pitches for a durable, weather-tight install.

Key Features:

• Retrofit split design with snap-on fasteners for fast, secure closure.
• Marked sizing rings for accurate, on-site trimming.
• Flexible EPDM base conforms to panel profiles and varying roof pitches.
• Five-step install workflow: measure, trim, wrap, seal, fasten; collar can accept a zip tie.

• Product line: Standard Retrofit Master Flash.
• Part number: RF301BP.
• Size: #3.
• Material/color: EPDM, black.
• Pipe range: 9-1/2 in to 17 in (241–431 mm).
• Base size: 21-1/2 in (546 mm).
• Initial top opening: 9-1/2 in (241 mm).
• Installation method: Wraparound seam; seal; snap-on fasteners; optional zip tie at collar.
• Temperature guidance (EPDM, general): Continuous to about 212 °F (100 °C); intermittent to about 275 °F (135 °C).
• Typical use: Large roof or sidewall penetrations where slide-over boots won’t fit.

Q: What makes RF301BP a retrofit flashing?
A: It uses a split, wraparound boot with snap-on fasteners, so you can install around existing pipes without disassembly.

Q: What pipe sizes does size #3 cover?
A: 9-1/2 in to 17 in (241–431 mm).

Q: Do I need a clamp at the collar?
A: The seal is by compression once fastened; many installers add a zip tie at the collar. For the base, avoid petro-chemical-based sealants; urethane or silicone caulking is typically recommended.

Q: When should I choose silicone instead of EPDM?
A: Use silicone where sustained temperatures exceed typical EPDM ranges; check equipment temperature specs to select the right compound.