Drain Restrictor is built into this 1/8 male thread x 1/4 compression nut Elbow used commonly in connections to RO membrane housings and the drain line.
No longer available, but we will substitute the John Guest version ( 59JGFR50220 ).
.
The restrictors can be difficult, if not impossible to re-use.
We recommend purchasing the elbow with a restrictor already installed.
Either this version, part # 44FR125256JF, or the John Guest version, part # 59JGFR50220.