Q.D. Barb, 3/16, Silicone HP Tubing, to fit A-dec 300® and A-dec 500® Control Block; Pkg of 5 For A-dec 500® & 300® Series Package of 5 (A-dec # 026.175.01) A-dec®, A-dec 500® and A-dec 300® are 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.