Sump plumbing

[KTinner]

I recently bought a used 75g tank with some plumbing done on the overflow. I’m brand new to sumps and plumbing so could anyone tell me what I should buy to fit with these pieces for my sump?

 

[BaliReefBox]

one is prob for main drain and the other is for emergency drain...the left one has still got a hose spigot in place and the right it appears to be trimmed off. you can just get a female threaded pvc adaptor and screw it into postion then run flex hose or better still plumb with rigis pvc sched 40