Ro doohickey

What’s this? Struggling to put a rodi system together. This forum has helped a lot. But I haven’t been able to figure out where this goes or if I need it. It came with the ro membrane.

Looks like an adapter for the RO membrane in case the housing end cap is of different from the membrane.

Optional extra.

Toss it. You should never need that.

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Such a man thing to say… :joy::muscle:

You always have extra parts…