Hi everyone I purchased this acrylic reservoir. The bulkhead is for a dosing line. I need to change the bulkhead for a through in 3/8 RO quick connect. I can’t find it in on Amazon. I’m afraid I’m not ordering it the correct way. I tried a 3/8 bolt and it goes in the hole. So I’m not sure what I’m doing wrong. I ordered one and it was supposed to be a 3/8 but it obviously wasn’t. Any ideas?