General comments:

 - 1/16" Valco metal compression fittings are designed so that the tubing extends beyond the ferrule the exact amount needed to fill the void in the fitting so as to minimize dead volume.

 - Metal compression fittings can not be used with fused silica as the silica will shatter. The solution is to use the "FS" (fused silica) style ferrule where the ferrule has a straight extension beyond the cone. The extension fills the void as mentioned above, again to minimize dead volume.

 - Quoting the web site: "The one piece FS adapter, essentially a reducing ferrule, is recommended for use in fittings where the ferrule will not be removed. Connections are made and disconnected by loosening the fitting nut and sliding the tube out." To me, this says these ferrules can be reused. DO NOT reuse ferrules where the ferrule removal tool has been used; the tool may have created particles.

 - >>> From the gasbench manual: "For normal operation, the flow should range between 0.5 and 0.8 ml/min" and for flushing, "between  100 and 150 ml/min." <<<<<
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Bulkhead union ferrules:

 - FS1.5 (Valco) for the downstream helium + sample side. Here we do want to minimized dead volume.
 - 1/16” SGE GVF 16-003 for the upstream helium supply side. Dead volume here is inconsequential.
 - 1/16" SGE GVF 16-005 vespel for both ends of the water traps

____________________________________
 -SGE/TRAJAN-
http://www.sge.com/ the site is still there, but apparently acquired by Trajan
https://www.trajanscimed.com/collections/graphite-vespel-gc-ferrules

*** = supplied with gasbench/conflo

ONE HOLE:
***072654  GVF 16-005        one hole 0.5 mm      - current offering
***072659  GVF 16-003        one hole 0.3 mm      - part number not found
Alternate-
   0726591 15% Graphite/85% Vespel Vg/Micromass ferrule with 0.3/0.4 mm hole for 1/16" fitting, PK10
                                                  - current offering

TWO HOLE:
***       GVF 16(2)-005     two hole 0.5 mm       - part number not recorded
***072660 GVF 16(2)-003     two hole 0.3 mm       - part number not found

The 0.3 mm is to attach the sniffers to the MS inlet
The 0.5 mm is to pass the sniffers through the gasbench bulkhead fitting

The sniffers have always had different diameters:
   Reference - id 0.05mm, 1.5m
   Sample - id 0.1mm, 1.5m

so these newer current offerings have different size holes:
   0726641 15% Graphite/85% Vespel ferrule with 1 x 0.4 mm hole and 1 x 0.3 mm hole for 1/16" fitting, PK10
   0726640 15% Graphite/85% Vespel ferrule with 1 x 0.5 mm hole and 1 x 0.3 mm hole for 1/16" fitting, PK10
   0726642 15% Graphite/85% Vespel ferrule with 1 x 0.5 mm hole and 1 x 0.4 mm hole for 1/16" fitting, PK10
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 -VALCO-
https://www.vici.com/vfit/fs_fs.php
1/32" Valcon polyimide one-piece FS adapters - package of 5
FS tubing OD    Product No.
0.20 = 0.25 mm  FS.25-5
0.25 = 0.36 mm  FS.36-5
0.36 = 0.40 mm  FS.4-5
0.40 = 0.50 mm  FS.5-5
0.50 = 0.80 mm  ZF.5V-5

1/16" Valcon polyimide one-piece FS adapters
                            ***** = supplied with gasbench
FS tubing OD    Product No.
     < 0.20 mm  FS1.2-5
0.20 = 0.25 mm  FS1.25-5
0.25 = 0.30 mm  FS1.3-5     ***** ???
0.30 = 0.40 mm  FS1.4-5     ***** ???
0.40 = 0.50 mm  FS1.5-5     ***** the big brown fused silica is 0.45 od
0.50 = 0.80 mm  FS1.8-5
0.80 = 0.90 mm  FS1.9-5
0.90 = 1.0 mm   FS11.0-5
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CAPILLARY SIZES for future reference, from previous isogeochem missives (to which there may or may not be a shred of truth):

NOT FLOW RESTRICTING, connecting any 2 points:

    id 0.32mm, od 0.45mm, no longer than needed (the big brown stuff)

FLOW RESTRICTING:

    He to open splits - id 0.1mm, 0.5m (0.170 od)

    He to water trap (flushing) - id 0.1mm, 0.25m (0.170 od)

    He to measurement needle - id 0.075m, 1m

    Reference gas to ref split: id 0.05mm, 0.4m (0.150 od)

    Sample split to water trap 2, id 0.32mm, 0.2m (glued to bottom of split):

    Sniffers to MS:
       Reference - id 0.05mm, 1.5m
       Sample - id 0.1mm, 1.5m

Of course you can shorten them to shorten the delay, and the signal will be higher if you shorten the sample capillary.
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Polymicro Technologies (Molex.com)

Part# 1068150027
0.320mm ID, 0.450mm OD x 10m

Part# 1068150020
0.100mm ID, 0.170mm OD x 10m

Part# 1068150015
0.050mm ID, 0.150mm OD x 10m