Our Square Gutter and Fittings are manufactured by UK market leaders FloPlast.Square Gutter Unions are used to join together two sections of Square Gutter. They are also commonly referred to as joiners. For a quick overview of how all gutter unions work please take a look at the video below.Unions should be fixed to the fascia board through the pre-formed screw holes.We recommend the use of two of either our CS525 or CS530 Woodscrews. On the inside of each fitting are two clearly marked insertion lines. During installation, the gutter should be lined up with these marks to ensure that there is sufficient room for each length to expand and contract, which is a naturally occurring feature of all PVC Gutter systems throughout the year.All gutter seals should be lubricated with silicon spray lubricant, both to facilitate this thermal movement and to ensure an easy fit.For further information please visit our Guides and Tips Installation Section where you can watch a video demonstration of how to install your guttering.