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AP-Lok II 28mm Plastic Closures
AP-Lok III 28mm Plastic Closure
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AP-Lok 28mm

Closure Systems International’s AP-Lok is a one-piece / linerless 28mm closure especially designed for non-carbonated beverages that are filled using a hot-fill with pasteurization process. This closure’s advanced design offers bottlers secure sealing and maximum hygiene.

Robust Seal in a Linerless Design

  • One-piece / linerless design compatible with modified PCO 1810 and 1716 non-crystallized bottle finishes 
  • Three sealing points: inner plug, top sealing and outer plug
  • Low lubrication compared with lined closures, minimizing taste influence and preserving product integrity

Tamper Evidence Performance

  • Robust tamper evidence for consumer and product security
  • Delivers advanced “band break before seal loss” tamper evidence with bottle finishes meeting CSI specifications

Easy Application

  • Compatible with existing lines / settings

Washer Hole Feature for Superior Hygiene

  • AP-Lok’s washer hole feature promotes hygiene and preserves product quality
  • During pasteurization, steam can flow through washer holes and remove residue from bottle thread, preventing mold growth and improving hygiene

Indicator Mark

  • Application angle indicator mark located at the start of the thread, on the side of closure to assist with quality inspections
  • Enables measurement of application angle without opening closures on bottles with indicator marks

Total Closure & Capping Systems Solutions

  • In addition to quality closures, CSI provides capping equipment and unparalleled customer and technical service, globally.
  • CSI's closure systems solutions help customers maximize profits by increasing the marketability of their brands and optimizing their total cost of operations.
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Product Detail

Primary Market Segments Served

Bottled Water, Non Carbonated Soft Drinks

Application/Fill Processes

Hot-Fill, Hot-Fill with Pasteurization

Material Types


Closure Diameters


Bottle Finishes

1716, 1810

Bottle/Package Types

Plastic Non-Returnable Bottles

Knurl Options


Seal Types

One-Piece Linerless

Tamper Evidence

Tamper Evident Band - Standard

Brand Names



Rinse Hole Option

Requests or questions?

Research & Development: Innovation Capabilities

At CSI, R&D is a crucial component of innovation and a key factor in developing new competitive advantages. CSI follows a disciplined New Product Development process, utilizes a creative space for ideation known as Studio C and provides differentiated technology platforms known as Studio C Creations.

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