O.D. Polyurethane Supply Tubing, 5/16", Poly Blue, (3/16” I.D.) Priced per foot 5/16" O.D. tubing is used by A-dec® Replaces 24V Volt/150 Watt bulbs in older 6300 lights A-dec® is a registered trademark of A-dec, Inc. DCI has no affiliation with A-dec and A-dec has not authorized DCI replacement parts to be used on or in connection with A-dec® products.