General
Pipe size	M25 -
Connection system	Plug-in system -
Compatibility	With inserts C20, C32, C40 and bends -
Accessories	optional wing P761 -

The end and transition sleeve C25 from the brand Primo, type P955-25-NK, is a component for the installation of electrical conduits in concrete structures. It is designed for the continuation and secure fixation of M25 conduits in cast-in-place concrete or in precast concrete elements. The sleeve ensures a concrete-tight and tension-relieved anchoring, thereby maintaining the integrity of the structure and the functionality of the installed conduits.

Applications
The sleeve is intended for use in cast-in-place concrete structures, where the nail and adhesive base is nailed to the formwork. In precast concrete plants, the base is glued to the shuttering table. The construction enables a secure and durable fixation of the conduits, even under tension loads. The sleeve is part of a system that can also connect elbows and other sleeves via a plug system, enabling flexible and modular installation.

Functions and Equipment in Detail
The nail and adhesive base of the sleeve is designed to connect via a plug system with other sleeves and elbows. This allows for a continuous and stable guidance of conduits through the structure. Fixation is achieved either by nailing to the formwork in cast-in-place concrete or by gluing to the shuttering table in precast concrete plants. The sleeve is designed for M25 conduits, with transitions available in sizes M20, M32, and M40.

Technology Explained Simply
The concrete-tight anchoring is achieved through the special shape of the nail and adhesive base, which securely fits into the formwork or shuttering table. The tension relief ensures that the conduits are not damaged by mechanical loads. The plug system enables quick and secure assembly without additional tools. The sleeve is designed for use in electrical installation systems where durable and secure conduit guidance is required.

Compatibility and Accessories
The sleeve is compatible with other sleeves in the series, such as P955-40-NK (C40), P955-32-NK (C32), and P955-20-NK (C20), as well as with elbows. Optionally, wings (item P761) can be used to fix the sleeve directly to the steel reinforcement. These wings expand mounting options and allow precise positioning within the component.

Installation and Mounting
Mounting depends on the construction site: in cast-in-place concrete, the nail and adhesive base is nailed to the formwork; in precast concrete plants, it is glued to the shuttering table. The sleeve is then connected to the conduit and linked to other components via the plug system. Using wings (P761) allows additional fixation to the steel reinforcement, which is advantageous in complex installations.

Operational Advantages
The sleeve provides a concrete-tight and tension-relieved fixation, ensuring long-term stability of the installation. The plug system enables quick and secure assembly, reducing work time. Compatibility with various sizes and accessories increases flexibility in planning and executing installations. Use in cast-in-place concrete and precast concrete elements makes it universally applicable in various construction sectors.