SPECIAL Rainsoft Adapter coupling PN 51617 with o-rings ( large = 13287, smaller = 13305 ) but no clip ( RS19575 ).
This is used with Rainsoft In & Out head.
One Side ( the side that connects to the Tank Head ) is LARGER.
Sold Individually, so order 2 if you need a pair.
And again.. Clips sold Separately.
Self tapping SCREW is PN 13314, if don't already have, you'll need to order Separately.
REFERENCE the ( 3 ) Different parts you need... the adapter, special clip, and screw ( all SOLD SEPARATELY )