The Polypipe SB412 is 
a 135-degree single-socket bend for a 110mm (4-inch) soil pipe system, made of uPVC. It is used to change the direction of a wastewater system, particularly in tight spaces, and connects to other soil and vent fittings via its socket and spigot ends. These bends are available in colors like black, grey, and white and are certified to standards like BS4514 and EN1329. 
Key features
Function: Changes the direction of a soil pipe by 135 degrees.
Size: 110mm (4-inch) diameter.
Connection: Single socket for a push-fit or solvent weld connection.
Material: uPVC (unplasticized Polyvinyl Chloride).
Color: Available in black, grey, and white, among other options.
Certification: Meets BS4514 and EN1329 standards.