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 800074 Tube Holder Triple Variable Flow, only Price on request 801935 Charcoal Tube, Coconut Shell, Standard, 50/100mg, Price on request 800134 Tube Holder Collar Clip, for 7/16" OD, 5/16" ID Tu Price on request