Hello Hasanain,
Do you already have the water block BP-VG3090MV for your GPU card?
If you do, you can add the backplate water block BP-EVB3090 to your card too.
Also please send us an email, we will show you how to connect these two water blocks with your card.
shopservice@bitspower.com.tw
https://shop.bitspower.com/index.php?route=product/product&product_id=7918&search=3090
https://shop.bitspower.com/index.php?route=product/product&product_id=8034&search=3090