Square Pipe Socket The 65mm Black Square Line Pipe Socket for joining square downpipes with push-fit connection, no glue or mastic required for installation. The system offers a flow capacity in excess of Round Line gutter when removing rainwater from your roof. Suitable for new builds, house refurbishments, conservatories and extensions. Features & benefits Manufactured in the UK from durable, lightweight recyclable PVCu. Zero waste to landfill from the manufacturing processes. Recyclable packaging. This system is compatible with other plastic systems manufactured to BS EN 12200. Please see compatibility guide. Leave a 10mm gap between the end of the pipe and the bottom of the pipe socket to allow for expansion. Fix with 158864 pipe clip over the joint. Use two 32mm x 65mm screws. RAL Colour Jet Black 9005. Easy to install.