Charcoal Tube, Coconut Shell, Standard, 50/100mg, Back Catalog number: 801935 Manufacturer: SENSIDYNE Availability: 3 weeks Price on request - + Recommended 811-9981-50 Sorbent Tube, Porapak-N, 6X70, 88/44, 50/BX Price on request F-PRO-1218 Universal Tube Holder System - Instruction Manual Price on request 200113-10 Tube Holder Housing, 7-10 x 110mm, 5/8", L240 (Pac Price on request