Campbell Scientific AP200 CO2/H2O Atmospheric Profile System - Manual (Page 109)

Appendix H. Using Swagelok ® Fittings
TABLE H-5. Dimensions and Part Numbers for
Swagelok ® Caps
Tubing OD (in) Swagelok ® pn CSI pn
1/8 B-200-C 19219
1/4 B-400-C 15831
3/8 B-600-C 15547
1/2 B-810-C 17335
5/8 B-1010-C 19496
H-5