Yes is acetal, is really nice.
I hope that water coming out from radiator will not comes out through fill port some how.
So just under DD acetal T fitting will be a laing ultra pump going to EK Supreme and then back into radiator so it will be v. very short loop. so there will be no loose any of flow.
I just ordered Bitspower compression fittings they will go onto EK Supreme
This looks awesome on EK block