Easy install is a nightmare. Need to replace Pfister s10-030. How do you know how tight is tight enough? I put it in cold and there is slight leak. Package looks like it’s been opened before so I try the other one, still leaks. Tighten more, a little at a time. Back and forth, water on and off. Make sure there is no old washer stuck inside. Now I think too tight, plastic washer looks deformed. Put first one back on and yeah, no leak finally. Only thing I put on threads was some plumbers grease. Still need to do hot side. How tight? Re arrow shows washer squeezing out side. Oops