The union for our square steel guttering system, also referred to as the gutter joiner, is used to join two lengths of guttering together. We recommend that you spray the base of the union with silicone lubricant before laying the guttering lengths and you should leave a small gap of 2mm between lengths for expansionThe use of seals in this union provide a 100% watertight join when linking gutters. The lengths of gutter are inserted into the union on a lever which ensures tight adhesion to the bottom of the connector.