A 1/4″ FFL flare nut and 3/8″ barbed stem fitting. Both the nut and the nipple move independently but unlike other FFL fittings this will not come apart. It is used with MFL disconnects to attach 3/8″ inner diameter hose.

California Proposition 65

Proposition 65 Warning: This product contains chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm.