S4-CF-ML6-NS4
304 SS, FITOK 6D Series Tube Fitting, Female Connector, 6mm O.D. × 1/4 Female NPT
S4-CM-ML6-NS4
304 SS, FITOK 6D Series Tube Fitting, Male Connector, 6mm O.D. × 1/4 Male NPT
S4-CM-ML6-RT4
304 SS, FITOK 6D Series Tube Fitting, Male Connector, 6mm O.D. × 1/4 Male ISO Tapered Thread(RT)