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Copper Closures & Terminals


3M Telecommunications extensive "know-how" has produced a variety of copper closure sealing options with both encapsulated and mechanically-closed closures available. View our full Copper Closure & Terminals brochure.

3m also offers an extensive range of fibre closures and terminals, click here for details.

Hover over each product title to view full description.

Pressurized Copper Closures
2 Type - Series Copper Closures

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A complete pressure tight closure system for enclosing spliced connections of communications cable in a wide variety of applications. This system allows for quick and easy re-entry of closure and it eliminates refurbishing of closure assembly. The cover clips free craftsman’s hands by holding cover assembly to endplates. They also keep endplates properly spaced and parallel during splicing. The 2-Type Closure System is re-enterable and reusable.
Non-Pressurized Copper Closures
One Step Small Copper Closures (OSC)

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OSS and OSL closures are one piece, tool-free, one-hand / one-operation, small size, mechanical, copper cable splice closures. Simply pressing the two shelves of the closure together by hand, closure locks and seals the splice. Closure body is made out of thermoplastic material and the sealing is a 3M proprietary gel. Splice area in the middle of the closure is non-filled and the sealing material is surrounding the splice cell. Top shelve and bottom shelve of the closure are hinged from the back edge and when the closure is closed, sealing gel on the top and the bottom shelves meet/compress each other by sealing the cable entries automatically. “Cable Tie” and/or “special design build-in strain relief” provide cable retention. The design of the closure allows re-entries by simply unlatching the locking mechanism.
Dome Copper Closures
An economical method of protecting butt splices for pedestal, hand hole or pole mount applications is provided by the reenterable PST dome closures. The closure provides protection from the harmful effects of moisture, insects, and ultraviolet light, while providing easy reentry. The dome closure is an easily reenterable closure that protects the splice without special tools or flame for installation.

The splice is enclosed in a split polypropylene dome clamped together with a steel latch and sealed with an O-ring. An expanded ethylene propylene rubber tube (PST) is slipped over the base of the enclosure and onto a gel sealing collar. Pulling a plastic rip cord on the PST allows it to shrink to the minimum outside diameter necessary to form a tight seal. The flexible tubing material conforms to the shape of the collar, sealing out both air and water.

The kit is available in four sizes, which accommodate splices from 25- to 900-pair.
Z - watertight Copper Closures

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3M Z Watertight Closure System is one of the most versatile closure systems for protecting copper conductors. The Z Watertight Closure is an economical closure which is available in one size, from one stock, in a kit that includes all the components required for quick and easy installation. The system can organize and protect mechanical and fusion fibre optic splices in the outside plant and buildings of up to 18 fibre optic splice modules. The Z Watertight closure system is watertight and non-pressurized which makes protecting up to 300-pairs of copper conductor splices a breeze. The Z Watertight closure also comes in a fire-retardant version for a variety of innovative building applications.
K & B Vault & Riser Copper Closures
K&B closures are strong, lightweight, and protect a wide variety of vault splice configurations with an air and water tight seal. K&B closures offer a full product line that is simple to install and reenter. This full product offering provides closures in standard kits to protect the majority of cable configurations and customized and special closures to meet your vault requirements. All K&B closures are flame retardant.
Encapsulated Copper Closures
Scotchcast™ 89 Series Copper Closures
These rigid body closures use a gravity fill method of encapsulating and protecting cables. They are packed with 8882 high gel reenterable encapsulant for easy re-entry.
Better Buried Copper Closures

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The buried compound compression closure method forces the encapsulant up the cable core to stop water ingress. The product is simple to install, comes with the spacer web and plastic wrap and is used to hold and force the encapsulant. The product is offered in different sizes to cover various cable ranges and can be easily extended and bricked. Better buried closures and 3M™ Scotchcast™ Closures 89 Series use a gravity fill method of encapsulating and protecting the cable splice. Both kits are simple to install and are offered with a full product offering to cover the complete cable ranges found in the outside plant.
Foam Sealed Copper Closures

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3832 Buried Service Wire Copper Closures
The 3832 buried service wire splice kit will accommodate inline and butt splices of up to five-pair filled or unfilled service wire. One "A" size bag of 4403 encapsulant and a split bolt are provided with the kit. Once the compound has been poured, an outer tube is rotated over the barrel opening to seal the unit, requiring no waiting for the compound to cure before the kit is buried.
3838 PST Buried Service Wire Kit Copper Closures
The 3838 PST/gel buried service splice kit is a flexible and "non-compound" splicing system that provides fast, reliable and easy protection. This kit will accommodate inline, butt and extended splices of up to six pair buried service wire. The new kit utilizes non-toxic PST and gel technology and provides an excellent waterproof environment.

It meets tough qualification tests such as impact and pull-out resistance, water immersion and freeze thaw cycle test in wet sand. The shield bond connector is specially designed to provide good electrical continuity and strain relief at the same time. The 3838 PST/gel buried service wire kit is simple to use and requires minimal training.
Free Breathing Copper Closures
Slic Aerial Copper Closures

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Designed to cost-effectively deploy aerial fibre networks. Weather-tight, single-piece aerial closure can be easily installed for new construction or maintenance situations and permits complete splice access after placement without the removal of the closure from the cable. This free-breathing closure (FBC) features a durable double-walled, blow-molded body that resists cracking or breaking even in the harshest environments. Maximum splice capacity is 144 for single and 432 for mass fusion.
Slic Aerial Copper Terminals

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This weather-tight aerial closure can easily be installed for new construction or maintenance situations. Proven, single-piece construction permits complete splice access after placement without the removal of the closure from the cable because it has two separate chambers: a distribution cable splice chamber and a drop termination chamber. Can handle up to 12 external or internal drop cable terminations.