When I removed mine, one side had about a 2" reinforced vinyl hose section with a PEX crimp ring. I cut the crimp ring off with a diagonal wire cutter and slid the barbed end out of the hose. After removing the canister and wall bracket, I could just turn it off the other fitting (which was an elbow into real PEX). Then I found a double-female connector with the right thread (for $0.89CDN), threaded in the straight connector that I pulled out of the vinyl hose, screwed it onto the other connector that was still attached to the PEX (teflon tape on both), slipped the barbed end back in the vinyl hose, one small hose clamp and done!
Now I have a lot less volume to the plumbing system (won't take so much antifreeze) and don't have to take off the canister to drain the lines between trips. No worries about it freezing/cracking/unscrewing and the carbon filters for the external filter I already had lying around are 1/3 the price of the KW-1.
Anybody wanna buy a complete FR1 filter unit with bracket, canister wrench and unused (still in shrink-wrap) KW-1 cartridge?
2015 Rockwood Signature UltraLite 8282WS Platinum, GY Marathon LRD, TST 507RV TPMS
2005 GMC 2500HD CCSB D/A, Curt E16, Prodigy P2, Garmin RV760LMT w/BC-20 b/u cam