Tube Holder Kit, Quad Variable, 6 x 70mm Back Catalog number: 800231 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended 200187 Tube Holder Adapter, 3/16" to 1/4" Ends Price on request 800238 Tube Holder O-Ring Kit Price on request 801935 Charcoal Tube, Coconut Shell, Standard, 50/100mg, Price on request