From Floplast
135 Degree Gutter Angles, or 45 angles as they sometimes referred to as, are generally used when the guttering and fascia runs above a bay window. As the system is symmetrical, both internal and external corners use the same fitting - there is no difference. FloPlast recommend the use of lubricant on all gutter seals for ease of fitting and improved performance. Features & Benefits: A semi - elliptical profile. High capacity - ideal for large roof areas. Pre-fitted gutter seal retaining clip system for fast user friendly installation. The high flow rate could result in less outlets and reduced drainage runs. Both 68mm and 80mm round downpipes can be connected to the gutter system.