LiftMaster 501012 Exterior Air Switch SPDT
The LiftMaster 501012 is an exterior SPDT air switch used in pneumatic treadle hose systems. It converts the air pulse from a compressed drive-over hose into an electrical switch signal for compatible control equipment.
What This Part Does
When a vehicle drives over the connected treadle hose, air pressure travels through the hose to the air switch. The switch then changes state so the connected gate, commercial door, signal, counter, or access-control circuit can respond. This is a component-level pneumatic switch, not a complete treadle hose kit.
Compatible With / Common Applications
Known and commonly referenced uses for 501012 / 50-101-2 include the following pneumatic signal applications. Confirm enclosure type, switch contacts, wiring requirements, and hose connection before ordering.
- Pneumatic treadle hose and drive-over signal tube systems requiring an exterior SPDT air switch.
- Commercial overhead door activation or signal systems using a pneumatic hose input.
- Gate operator, parking, apartment entry, service station, car wash and vehicle-counting applications using a pneumatic air switch interface.
- LiftMaster pneumatic control setups where the original switch is marked 501012 or 50-101-2.
- Outdoor/exterior installations when the existing switch assembly and enclosure style match the replacement part.
Compatible Accessories and Related Items
These related items are commonly used with this product family when the opener generation and learn-button color match.
- 50102 10 ft treadle signal hose when a replacement hose is needed for compatible pneumatic systems.
- Signal tube / drive-over hose sold by length for compatible pneumatic vehicle detection systems.
- Compatible control stations or operator inputs that accept the air-switch contact output.
Features and Specifications
| Feature / Specification | Details |
|---|
| Manufacturer | LiftMaster |
| Product Type | Exterior pneumatic air switch |
| Part Number | 501012 |
| Cross-Reference | 50-101-2 |
| Switch Type | SPDT |
| Application | Pneumatic treadle hose / drive-over hose vehicle signal systems |
| Compatible Operator Type | Commercial door, gate, and access-control systems using pneumatic switching |
| Indoor / Outdoor Use | Exterior application when matched to the proper enclosure and installation |
| Notes | 501012 is the switch; 50102 is generally associated with the 10 ft treadle signal hose |
Also Known As / Related Part Numbers
- 501012
- 50-101-2
- 50-100
- 000000000000501012
- LiftMaster exterior air switch
- LiftMaster SPDT air switch
- Pneumatic exterior switch
- Drive-over hose air switch
Technician Notes
- This item should not be confused with 50102 treadle signal hose. 501012 is the exterior air switch component.
- Confirm whether the existing system needs a switch, hose, enclosure, coil cord, or complete treadle assembly.
- SPDT contact wiring should be matched to the existing control circuit. Do not bypass safety inputs or required monitored protection devices.
Before Ordering
- Confirm the old switch is marked 501012, 50-101-2, or a matching exterior SPDT air switch reference.
- Confirm the system uses pneumatic hose pressure, not loop detection or photo eye detection.
- Check the hose connection and enclosure style.
- Confirm the connected control circuit expects an SPDT switch contact.
- Use a qualified technician for wiring into commercial door, gate, or access-control equipment.
Professional Advisory
This part may connect into commercial door or gate control circuits. For unsafe movement, damaged wiring, or unclear control inputs, have a qualified door or gate technician diagnose the system before replacing parts.
Product Questions and Answers
Is 501012 the same as 50102?
No. 501012 is commonly referenced as the exterior SPDT air switch, while 50102 is generally associated with the 10 ft treadle signal hose.
What does an exterior air switch do?
It senses the air pulse from a compressed treadle hose and changes an electrical contact for the connected control system.
Is this a complete vehicle detector kit?
No. This is the air switch component. A complete pneumatic system may also use treadle hose, fittings, enclosure hardware, wiring, and a compatible control input.
Can this be used outdoors?
It is commonly referenced as an exterior air switch, but the enclosure, fittings, and installation must match the environment and existing system.
Can I wire this directly to a gate operator?
Only if the operator input and the control design are compatible. Do not bypass safety devices, and use a qualified technician for commercial door or gate wiring.
