Bubble Blaster Hy5000

I got a question. Does the pump have an o ring behind the impeller? If yes, do you guys sell them? I bought a used SRO XP5000 and the guy that sold it to me cleaned before sending it to me but as soon as i installed it has a leak but there is nothing cracked. So im thinking it uses an o ring please help me with this. Thank you. Here is an attached picture.