Locline plumbing question

[USMA36]

I’m setting up my new tank and I have a question. The tank is drilled for 1” returns. I have 2 1” slip x slip bulkheads for the returns. Looking around I cannot find locline in that 1” size. I suppose I can reduce it but then I can’t find either a slip locline fitting. I can only find threaded or a reducer that’s threaded on the tank side and slip outside of the tank. How do you all with larger returns have them setup? My drains from the EMS overflow are 1.5”.

 

[redfishbluefish]

I think what you want is a 1 inch slip to 3/4 inch threaded reducing bushing. Glue thus in on the inside of the bulkhead and use 3/4 LocLine

 

[zukihara]

I swear I saw a post yesterday about someone other than normal aquarium places selling 1" loc line equivalent if you wanted to go that route. 3/4 seems plenty though