Its not about recirculating, that was the previous link that showed you what to do. But in that link it is for in-sump ASM skimmers with uniseals. You cannot use uniseals, you need bulkheads that won't leak. In the RDSB thread I posted, I remember there being some info on curved bulkheads because for a RDSB in a bucket they have to deal with sealing a curved surface (a 5g bucket) just like you have to deal with sealing your curved skimmer body.
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