FC6022 Rubber Coupling Flexible Connector - 2.5" x 2.5" is a type of flexible pipe coupling used for joining non-pressure drain, waste, and vent (DWV) piping systems. A prominent equivalent product is the Fernco 6022 series coupling. 
Key Features and Specifications
Size: 2.5 inches x 2.5 inches (nominal).
Material: Made of high-quality elastomeric polyvinyl chloride (PVC) or EPDM rubber with corrosion-resistant 300 series stainless steel clamps.
Pipe Compatibility: Designed to connect a variety of pipe materials including cast iron, plastic (PVC, ABS), steel, copper, or lead pipes.
Applications: Primarily used for non-pressure sewer, drain, waste, and vent piping applications, both indoors and outdoors, and is rated for underground use.
Pressure Rating: Maximum test pressure of 4.3 PSI (29.6 KPA). It is not intended for pressurized plumbing systems.
Temperature Range: Suitable for continuous temperatures from -30°F to 140°F (-30ºC to 60ºC).
Resistance: The coupling provides a leak-proof, root-proof seal and is resistant to chemicals, UV rays, fungus growth, and sewer gases.
Installation: Easy to install with a screwdriver or torque wrench; no special tools, primer, or glue are needed.
Certifications: Conforms to industry standards such as ASTM C1173, ASTM D5926, and CSA B602, ensuring quality and reliability.