Aztec Washer Company RS101BA - Residential Master Flash - Black

Aztec Washer RS101BA is the size #1 Residential Master Flash, molded from UV- and ozone-resistant black EPDM with a lead-free aluminum base that forms to common roof profiles. A built-in 20° pitch helps it sit correctly on steep roofs, while pull-tab, smooth tear rings make trimming fast and clean on site. Designed for residential pipe penetrations, it maintains a weather-tight seal and is compatible with type-B heated vent pipes. The EPDM version carries a 25-year limited warranty when installed per guidelines.

Key Features:

• Black EPDM sleeve compounded for weathering resistance; flexible to absorb vibration and thermal movement.
• Built-in 20° pitch; suitable for roof pitches up to about 45°.
• Pull-tab, smooth tear rings for knife-free, accurate sizing.
• Lead-free aluminum base conforms to most panel configurations.

• Product line: Residential Master Flash, size #1.
• Part number: RS101BA.
• Material/color: EPDM, black; base is lead-free aluminum.
• Pipe range: 2-3/4 in to 8 in (69–203 mm).
• Top opening (as shipped): 2-3/4 in to 3-1/4 in (69–82 mm), trim to suit.
• Base size: 20 in × 24 in (508 × 609 mm).
• Built-in pitch: 20°; suitable for roof pitches up to about 45°.
• Listings/warranty: compatible with type-B vents; EPDM 25-year limited warranty.
• Typical use: residential roof penetrations; form base to roof profile and seal per standard practice.

Q: What pipe sizes does RS101BA cover?
A: 2-3/4 inches to 8 inches (69–203 mm), trimmed to fit.

Q: Can I use it on a steep roof?
A: Yes. The built-in 20° pitch allows installation on slopes up to about 45°.

Q: What is the base made from?
A: Lead-free aluminum designed to form over common roof panel profiles.

Q: When should I choose silicone instead of EPDM?
A: Use silicone for sustained higher temperatures; EPDM is generally suitable up to about 212 °F continuous and 275 °F intermittent.