Tedlar® PVF Sampling Bags PTFE On/Off valve, 1,6L Back Catalog number: HEDTDLC31Z_1.6L Availability: In the manufacturer's stock Price on request - + Recommended M-MCHOR O-Ring, micro-chamber pan seal, for M-CTE120I,pk 6 Price on request M-TCN04 O-Ring, size 007, and spacer,pk 6 Price on request U-T6SUL-2S Sulphur/labile cold trap, Price on request