Push Fit Coupling With Centre Stop
Polypipe SH44 is 
a 4-inch (110mm) double socket coupling used to join two plain-ended soil pipes. It is made of uPVC, comes in various colors (like black, grey, or white), and is available in both ring-seal (push-fit) and solvent-weld options. The coupling complies with standards such as BS EN 1329-1 and BS 4514. 
Features and uses
Joining pipes: It's a straight coupling designed to connect two plain-ended 4-inch (110mm) pipes together.
Material: Made from durable uPVC.
Installation types: It can be a "ring-seal" (push-fit) coupling or a "solvent-weld" coupling, depending on the specific product code and intended application.
Slip coupling: The center stop can be removed to allow it to be used as a slip coupling, which allows for greater flexibility in installation.
Standards and compliance: It is manufactured to comply with BS EN 1329-1 and BS 4514, which are standards for PVCu soil pipes and fittings.
Color options: Available in multiple colors to match different installations, such as black, grey, white, and brown.