Hi Johnny,
It is better to add a T-fitting, such as (BP-TBRGIG2) to the output of the pump.
And use the water-exhaust fitting and soft tubing fitting and soft tube.
Nvidia 4090 is hotter than 3080ti, it is better to add one more radiator,
such as a 240 or 360 slim one.
You can connect the radiator with the soft tube and soft tubing fitting.
If you have any questions, feel free to contact us.
https://shop.bitspower.com/index.php?route=product/product&product_id=7280&search=BP-TBRGIG2
https://shop.bitspower.com/index.php?route=product/product&product_id=6991&search=exhaust&page=3
https://shop.bitspower.com/index.php?route=product/product&product_id=3961
https://shop.bitspower.com/index.php?route=product/product&product_id=2898&search=3858
https://shop.bitspower.com/index.php?route=product/search&search=BP-NLSF