Railing Connectors. Create a stylish railing system with our wide selection of joints, elbows and railing connectors. Made of 100% solid brass this tubing splice joint (or coupler) is used when butt style joints are required. Splices are inserted within the tubing with some force and held in place with adhesive. Please note splice joints should be placed within 12 inches of a support post or bracket. Sold individually, fits our 1 1/2 inch tubing.