Stainless Steel Fittings include nuts and ferrules. They are equivalent to Parker and SWAGELOK. Tees and Crosses connect two or more columns from the injector (0.020" bore), and join multiple solvent lines before the injector (0.040" bore). Tees and crosses take 1/16" OD tubing. Tee includes three ferrules and nuts each. Cross includes four ferrules and nuts each. Zero dead-volume (ZDV) unions connects tubing without any dead volume.