Stop flooding gray & black water in your Camper & Caravan

I have seen campervans and caravans having grey & blackwater flooding inside. For some reason it seems to be difficult to find information and solutions about this issue. Apparently it rarely happens but when it does the damage is significant. That's why I came up with a solution myself and would like to share it with you. Additional I also show you the connections to the waste water tank and connection to the shower tray.
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Product used:
Gray & black water drawback valve 40mm : https://www.amazon.nl/well2wellness-well2wellness%C2%AE-Pvc-Kegelr%C3%BCckschlagventil-terugslagklep-40mm/dp/B07S7BT4YR/ref=sr_1_4?adgrpid=104545786465&gclid=Cj0KCQiAys2MBhDOARIsAFf1D1ed4a0x0GXr8MD05R3ecRZ4PWMmqjAJkhtcuZH_CVW-fV-Ej72kSGwaAjnqEALw_wcB&hvadid=451170206313&hvdev=c&hvlocphy=1001038&hvnetw=g&hvqmt=e&hvrand=16632906053676645124&hvtargid=kwd-396849144184&hydadcr=21328_2100449&keywords=terugslagklep+40mm&qid=1637092379&sr=8-4

Видео Stop flooding gray & black water in your Camper & Caravan канала Easy Van Life