Sorbent Tube, Porapak-N, 6X70, 88/44, 50/BX Back Catalog number: 811-9981-50 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended 800139 Tube Holder Adapter for 1/2" Ends Price on request 800165-10 Sorbent tube adapter nipple for Dual manifold High Price on request 200157 U-Tube replacement for P/N 800143 Price on request