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Why the Air-Lock?

A lightweight, dual-suspension pin system designed to combine suction suspension comfort with pin suspension security. The airtight seal prevents air from coming into the bottom of the socket, creating suction and reducing pistoning even without a sleeve!

  • Suction allows for less traction on the limb for increased comfort and decreased liner wear

  • Expulsion valve or suspension sleeve are not needed to maintain suction in most cases

  • Water-resistant

  • Dual suspension, suction pin lock system

  • Gain extra suspension even without a sleeve

  • Reduces pistoning and traction on end of limb

  • Decreases distal pressure

  • Single-stage lamination

  • Offset alignment capablity

  • *Do not use with elevated vacuum

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300+ dives with the Air-Lock!

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With the Air-Lock's unique dual suspension, it makes the prosthesis a part of you.

What Creates the Suction?

The pin attaching the liner firmly into the distal end of the airtight lock and socket holds the residual limb in place. From the pin holding stable at the bottom of the socket the only place for trapped air to go is out the top of the socket. As the fleshy part of the limb moves and takes up more space this creates pressure pushing more air out, creating negative pressure or suction in the lower part of the socket holding the limb more firmly in place over a larger area and helping to eliminate pistoning.

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New Valve - Now Available


Integrated into the Air-Lock Push Button
Sold Separately

An after-market addition that 
can be retrofitted on All Air-Locks.

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Easy to retrofit, just replace the original push button with the New Air-Lock Push Button Valve.

  • Quiet expulsion.

  • No need to create holes in the side of the socket.

  • Water-Resistant

CD103BV | Air-Lock Push Button Valve
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Locks are

Sand, Mud & Water-Resistant

For whatever life brings.

Air-Lock Sizes & Depth


CD103 | Air-Lock

84 GRAMS, 2.26" diameter

350 lb weight limit

Build height: 1.77"

Amputation Type: AK, BK

Activity Level: Any

Patent No.: 6334876


CD103D | Deep Air-Lock

350 lb weight limit

Build height: 2.19"

Amputation Type: AK, BK

**Deeper housing to accept the long pin. Adds extra /25" of length to the pin. Includes most parts of fabrication


CD103M | Medium Air-Lock

57 grams, 1.85" diamater

350 lb weight limit

Build Height: 1.71"

Amputation Type: AK, BK, UE, Peds

Activity Level: Any


CD103MD | Medium Deep Air-Lock

57 grams, 1.85" diamater

350 lb weight limit

Build Height: 2.125"

Amputation Type: AK, BK, UE, Peds

Activity Level: Any


CD103S | Small Air-Lock

35 grams, 1.24" diamater

350 lb weight limit

Build Height: 1.62"

Amputation Type: AK, BK, UE, Peds

Activity Level: Any


CD103SD | Small Deep Air-Lock

350 lb weight limit

Build Height: 2.01"

Amputation Type: AK, BK, UE, Peds

**Deeper housing to accept the long pin. Adds extra 0.350" of length to pin. Includes most parts for fabrication. Pin and Connector sold separately

The size of the distal end of the residual limb dictates the lock size. Try to come as close as you can to matching the funnel size to the distal end of the residual limb this will help to minimize air gaps in the socket.



The two-part pin has been our standard for years. The solid brass pin can be quieter and has a higher pull strength. The thread is determined by which liner you choose.

Which Pin to Choose?

Air-Lock Example

& Product Recommendations


A prosthetic arm using a Small Air-Lock with deep recess for the button. This recess was created by using a CD103ELD (Exo Lamination Plug) during fabrication. The button is capped with a CD103RBC (Release Button Cover) nicely filling the hole and giving the recessed hole a more finished look while making the button more comfortable and easy to push


The CD103RBC Release Button Cover can give a more finished look when using the Exo Lamination Plug. The Release Button Cover is added to the end of the release button to make it easier for patients to release the lock.

*Ideal for geriatric patients or others with lower dexterity or limited hand strength


The recessed button in this Air-Lock transradial socket was fabricated using the CD103ELP Exo Lamination Plug.


If lock plate replacement is happening frequently, make sure you are adjusting pin spacers to minimize pistoning. If the prosthetic is used in a gritty, sandy environment you might have the patient clean out the bottom of the socket more frequently.

*CD103LP: the part # for the replacement lock


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Single Lamination & Offset Fabrication

The fabrication procedure for the Air-Lock is a time and money saver. The Alignable Connector is attached to the lock in the desired location for prosthetic alignment, allowing the lock to remain in ideal lock alignment for easy engagement. A single lamination is done that incorporates the lock and the connector into the socket. The offset capability saves money by eliminating the need for offset components and saves time with a single lamination and easy component set up. 

Billing Information: Recommended Codes

L5671: Addition to lower extremity, Below Knee/Above Knee suspension locking mechanism (shuttle, lanyard, or equal), excludes socket insert

*L5647: Addition to lower extremity, Below Knee, suction socket

*L5652: Addition to lower extremity, suction suspension, Above Knee or Knee Disarticulation Socket

L6698: Upper extremity addition, Below Elbow/Above Elbow lock mechanism, excludes socket insert

*L6686: Upper extremity addition, suction socket

*Not recommended for billing Medicare. Coyote believes that "suction" in a prosthesis refers to the negative pressure created inside the socket, rather than componentry such as an expulsion valve or sleeve. Because we think suction as a function, we believe it should be permitted to bill L5671 in conjunction with the L5647 or L5652 in cases when it is medically necessary. As with other situations where multiple suspension methods are used and billed we feel the combination of a lock and suction helps to increase safety for the patient.

The listing of codes with our products should not be construed as a guarantee for coverage and/or payment.

The ultimate responsibility for the coding of services/products rests with the individual practitioner.

For more information regarding billing the Air-Lock and our socket pressure study between airtight and traditional pins, please fill out the contact form below or head to our Contact page for more options.

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