Swagelok SS-8-VCR-1-4
SWAGELOK SS-8-VCR-1-4 & SS-8-VCR-1-6, Male NPT Connector 1/2", LOT OF 6#1215P12
You will notice the Oil Equipment Mfg 4171 has a nice balance of strength and ease of use.
x3 NEW SS-8-VCR-1-4 Swagelok Male NPT Connector Body 1/2in VCR x 1/4in MNPT 3pc
A nice touch from Honeywell is the reinforced connection points.