B-290 1830 uses Bobrick's "2S" tab design (per spec sheet

Flexible: Adjusts between two speeds to control airflow and sound level

For use with Rubbermaid Commercial Sanitizing Stations (sold separately)

The ASI 3502-48 is a straight grab bar that measures 1-1/4 inches in diameter

secure the adjustable flange the same way — the adjustable flange absorbs variation in wall thickness within the supported range

Bobrick B-8281-25 Top Housing Assembly Foam,Includes Installation Hardware Packet and Foam Mixer Housing Manual Roll Paper Towel Dispensers B-290 1830 uses Bobrick's "2S"Bobrick B 8281 25 Top Housing Assembly Foam,Includes Installation Hardware Packet and Foam Mixer Housing