Hello. I own the following oil and water separator.

https://www.amazon.com/Separator-Compressor-4500Psi-Filter-L350mm/dp/B07V4F6H1X/ref=sxin_22_pa_sp_phone_search_thematic_sspa?content-id=amzn1.sym.37e3b3b9-8d0e-45b0-93aa-6b62717fdd17%3Aamzn1.sym.37e3b3b9-8d0e-45b0-93aa-6b62717fdd17&cv_ct_cx=oil+water+separator&keywords=oil+water+separator&pd_rd_i=B07V4F6H1X&pd_rd_r=9252ba0c-c575-4cc4-8d25-f332defac32e&pd_rd_w=IG98r&pd_rd_wg=HhrIH&pf_rd_p=37e3b3b9-8d0e-45b0-93aa-6b62717fdd17&pf_rd_r=Q48R50R7JH25HKW8SVWY&qid=1683589947&sbo=RZvfv%2F%2FHxDF%2BO5021pAnSA%3D%3D&sr=1-2-364cf978-ce2a-480a-9bb0-bdb96faa0f61-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUFHTzIzMzhIUVpNVVAmZW5jcnlwdGVkSWQ9QTA1MDQ3OTQzTlBDODlUNFhaRjJXJmVuY3J5cHRlZEFkSWQ9QTAyNzc4OTQzRzZFQzBUWTZSNk0md2lkZ2V0TmFtZT1zcF9waG9uZV9zZWFyY2hfdGhlbWF0aWMmYWN0aW9uPWNsaWNrUmVkaXJlY3QmZG9Ob3RMb2dDbGljaz10cnVl

I want to be able to keep the air inside so I don't have to fill it every time. I know I need a one way foster for the inlet. I'm thinking of this one.

https://www.amazon.com/Quick-Connection-Check-Foster-Nipple/dp/B07J2G5VWH/ref=mp_s_a_1_1?crid=15ZLPM2J6R82K&keywords=8mm+male+m10+foster&qid=1683590154&sprefix=8mm+male+m10+foster%2Caps%2C162&sr=8-1

But I have no idea what to put on the other end. I need some kind of bleed valve, but I don't know what threading type or size. I've attached pictures of what's on the other end.

Thanks.