Tube Holder Adapter, 3/16" to 1/4" Ends Back Catalog number: 200187 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended 800066 Tube Holder Collar Clip, for 1/4" OD, 1/8" ID Tubing Price on request 811-9964-50 Sorbent Tube, Microlite, 8X110, 500mg, 50/BX Price on request 200524 Tube Holder Tubing, 3/16" ID x 1/16" W (10 ft) Price on request