Push straight onto copper tube (use Pipe Inserts for plastic pipe). Removable and re-usable. Water Research Council Approved. British Gas Service Approved for water pipes. No tools needed. BS 7291/PT1/PT3. Use 1m of copper pipe when coupling to a boiler. Speedfit is updating some fittings, so certain items received may vary in appearance to those pictured, but are of equal or better quality.