Help with plumbing an external overflow return

[mwbbrown]

Hello,

I have acquired a 20 gallon lagoon style tank that was pre drilled for a modular marine external overflow box. The previous owner drilled it and never got around to setting it up.

He included the bulkhead to fit the holes and what I thought was a return nozzel for loc line but as I'm trying to set it up I think I've got some problems.

The return pump I have outputs a 3/4 inch line, and the largest loc line I can find looks to be that size but requires threading, which this bulkhead doesn't have. the bulkhead is 1 1/2 inch slip. I can't find a black 1 1/2 slip to thread adapter online or a 3/4 inch bulkhead that will fill the larger 1 3/4 inch hole in the tank.

My experience in life tells me if can't find an adapter for what I want to do then I probably am doing the wrong thing. Any advice on how to do this right, assuming I don't mind buying new parts?

 

[KrisReef]

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https://www.irrigationking.com/pvc-...kkJ9bquKDPRjNrGmwfzXpXhFEkizXohoCRZIQ AvD_BwE

Edit: Black, get some Krylon!

or schedule 80

https://www.supplyhouse.com/Spears-838-210-1-1-2-x-3-4-PVC-Sch-80-Flush-Style-Reducer-Bushing-Spigot-x-FPT?utm_source=google_ad&utm_medium=Shopping_Plumbing&utm_campaign=Shopping_X_Plumbing_X_SSC_New&utm_campaignid=22376725605&utm_adgroupid=175817623134&utm_targetid=pla-2435663902799&utm_product_id=838-210&utm_matchtype=&utm_keyword=&utm_adtype=pla&utm_category=Plumbing&gad_source=1&gad_campaignid=22376725605&gbraid=0AAAAAD_WAytQtVXjEWSU_3ko3WmeTu3Bl&gclid=CjwKCAjw08fSBhA7EiwAfbQTsB4pWuwZRc6LtJXyotTGgQ_oilzjltXMlaZEpOzUX5asFCQFbTno3xoCApAQAvD_BwE