the pipe pumps acts as true valves or do they allow overflow through the other direction, the pipes allow backflow if you're if that's what you're asking, pumps pumps yeah sorry pumps pumps do allow backflow it's only valves that block, backflow pumps pumps will like mitigate backflow but they won't stop it for some reason I don't know there's probably a reason why that is but if you don't like that material further on your site but that was the main reason why we added valves was because the pumps didn't feel that, functionality and the I guess they also kind of fool you because it feels like they should but they don't