Aquatop Riser Problem

I bought an EZ Clone awhile back which I am no longer using. So I figured I would use the water pump for my recirculating system that I am building. My issue is, the water pump which came with the EZ Clone (Aquatop NP-305) does not have threads in the outlet. Any ideas how to effectively attach a riser or how to attach my drip manifold to the water pump since I have no threads for a riser?
I need a good/safe/reliable solution, if possible, so everything stays attached and working properly while I am away from home. Im afraid the pressure would push the 1/2" tubing out if I try to just attach it that way. If I am missing something or if the answer is blindingly obvious, sorry lol. Still new to hydro. Any help is really appreciated. Thanks everyone

will pvc pipe fit in it? if so, glue it.
if not, buy a hose and a hose clamp that fits over it.

my aquatop didnt come with anything but the pump (see pic). It is just a hole for outlet and nothing else provided. I tried PVC but they are too big or too small.

I tried shaving the PVC down with a dremel but I can never get a perfect circle so it never fits right. I messaged aquatop asking if they would sale me the riser piece that it was suppose to come with and never heard back from them, guessing because I bought with a kit (purchased through Ebay) probably 2 or 3 years ago. pump is brand new, been used maybe 10 times which is why I wanted to use it for this. thanks for suggestion though

oh well, pick one up off ebay for a few bucks.