backup valve

Hi guys I have a Polaris Sport 3900. The back up valve is very weak so it will typically stay stuck in the same corner. I have spent some time reading the forums but couldn’t find the answer. check this link for the videos: iCloud In the past month I have replaced the wall fitting and also back...

While troubleshooting my back-up (backup) valve I was finding inconsistent info as to how much water should be coming out while the valve is closed. Below is a link to 2 videos: one shows the 14 year old valve and the other shows the new "Polaris" branded valve, which has just a trickle when...