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A polypropylene (PP) equal coupling is a straight connecting sleeve used to connect two pipes of the same diameter (63 mm) in a piping installation.
The term “equal” means both ends have the same diameter.
Technical characteristics
Material
Polypropylene (PP): robust, durable, resistant to corrosion and chemical agents.
Dimensions
Nominal diameter (DN): 63 mm → corresponds to standardized inner/outer diameter of the pipe.
Sleeve length varies by manufacturer (often between 50 and 80 mm).
Type of installation
Simple socket joint: pipes are inserted into the fitting by simple insertion.
Can be used with:
Sealing gasket (often EPDM rubber)
Gluing/fusion if specific fitting
Service temperature
Generally –20°C to +80°C (depending on standards and use).
Common standards
Often compliant with DIN EN 1451, ISO 15874, or local plumbing/sanitation standards.
Typical use
Connecting 63 mm PP pipes in:
wastewater drainage networks
underground or buried sanitation systems
gravity ventilation conduits
industrial or agricultural installations