Our Square Gutter and Fittings are manufactured by UK market leaders FloPlast.Square 135 degrees gutter angles (sometimes referred to as 45 degrees angles), are generally used on conservatories and bay windows. As square gutter is a symmetrical system, these fittings can be used on either external or internal corners. For a quick overview of gutter angles please watch the short video below:The guttering should always be supported by a fascia bracket within 150mm (6andquot;) of any 135 degrees angle. This is to prevent water from collecting in the fitting, which in turn would cause the gutter angle to drop down, putting stress on the joints and reducing the flow rate. You can view a video on how to correctly install FloPlast Gutter systems in our Installation section of Guides and Tips.