How to maintain the non-return valve on S3 water inlet

Check all O-rings and that the spring travels freely.

Check the rest of the housing for damages. A video tutorial of how you maintain the water non-return valve and replace the O-rings can be found below.

Note! When you disassemble parts with stainless steel thread, always remember to lubricate before reassembling. Watch the video tutorial How to lubricate stainless steel thread