I'm pretty late to this party, but I've got another question to throw in this here pond. I've also acquired a very similar product and it's got a lot more wear and tear on it but I'm hoping it can be restored. It's got three holes in the lid, I know you're supposed to screw in the pressure gage in the front hole, but the I'm not sure what the two back ones are for. I'm hoping someone can fill me in here. I'll provide a photo of I can
