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It wasn’t easy finding a straight answer on which pieces to use to adapt the RS plumbing to standard for the xl425. I messaged RS directly to find out that even though Part 42221 is not listed with the xl425 as a compatible system, the plumbing is the same diameter. Part 42222 is no longer made as 2 pieces that can be unscrewed, so this piece will no longer work.
All you have to do with Part 42221 is remove the barbed attachment by unscrewing it. Then take the O-ring and use it on your 3/4” thread to 1” slip adapter. Finally, use some pink tape on the threads to ensure a tight seal and screw the adapter to the RS piece. I used about 8 layers of tape. I have not tested my plumbing yet, so I will update on any leaks if needed.
Finally, here are the finished pieces that allow you to adapt RS to standard plumbing without any permanent modifications that cannot be undone.
All you have to do with Part 42221 is remove the barbed attachment by unscrewing it. Then take the O-ring and use it on your 3/4” thread to 1” slip adapter. Finally, use some pink tape on the threads to ensure a tight seal and screw the adapter to the RS piece. I used about 8 layers of tape. I have not tested my plumbing yet, so I will update on any leaks if needed.
Finally, here are the finished pieces that allow you to adapt RS to standard plumbing without any permanent modifications that cannot be undone.