Apeks has a proprietary power inflator ( and hose), too. Bigger diameter.
So that others using this thread as a reference in the future will understand exactly what you are referring to, here are pictures of the non-standard flat profile OPV that Apeks/Aqualung use, and the low profile OPV that Mares uses:
Apeks/Aqualung flat profile OPV:
Mares low profile OPV:
-Z