Installation of this union is a simple process. Slide the union fully onto one length of gutter, and position the next length of gutter alongside leaving a gap of no more than 2mm. Slide the union into position and use the rear locking tabs to clamp the gutter in place. Pull out the locking tab on the front of the union body, lower the clamp down onto the gutter and secure in place using the locking tab.This type of union should be supported with a fascia bracket (or rafter bracket) fitted within 150mm on each side.We recommend the use of silicon spray on all rubber seals to improve adhesion and long term seal performance.