Allied #4 Internal Bone [11-1021B] — 1-1/4" Air Button for Spa & Pool Controls

The Allied #4 Internal Bone air button is a precise replacement part for spa and pool panels. Made for Len Gordon sensor systems, it fits standard installation openings and delivers reliable actuation for residential and commercial spa setups.

• 1-1/4" Hole Size: Designed to fit standard spa and hot tub panel openings for a clean, secure installation.
• Mounting Hole: 1-3/16" mounting hole ensures stable attachment behind the control panel.
• Internal Bone Construction: Compact, flush-profile design that minimizes panel intrusion while maintaining durable operation.
• Brand & Compatibility: Allied Innovations (Len Gordon); a trusted choice for internal air-button systems used in spa controls.
• Part Number: 11-1021B (Allied #4) for accurate ordering and inventory alignment.
• Sensor Matching Guidance: For reliable performance, ensure the air button matches the type of air sensor in use; mismatched volume can affect activation and sensor longevity.

This internal bone button is ideal for technicians and DIY enthusiasts replacing worn or unresponsive spa buttons. Its exact fit and compatibility with Len Gordon sensors help maintain consistent control responses, reducing maintenance calls and downtime in pool and spa installations. Use it as part of a dependable spa parts kit to keep your hot tub or pool equipment delivering dependable, everyday performance.