This is a replacement for the Intex SPA 2020 model unit SKU 28457E. It replaces the flap on the inflation valve connector.
The controller unit itself is sold here:
https://intexcorp.com/replacement-parts/13027-spa-control-base-for-28461-21-version/
But if only the flap of the inflation valve is broken, that part is not sold separately.
This part is printable and I think it works. (for how long i do not know)
Printed it with ABS (PETG I think also works).
0.4 nozzle 0.15 layer height
Ad extra support under hinge part.
Thickness of the lid is different with version V1 en V2
Intex SPA air pump inflation flap V1 = 10mm height
Intex SPA air pump inflation flap V2=s 9 mm height
The author marked this model as their own original creation.