Jebao 915 intake/output leak

Hi just got a jebao 915 from one of the bros over here.
However upon testing, the intake/output leaks very slowly at the part where its turned to off and on. Is that part replaceable if not can it be removed directly?

The bro has made a very good gesture to come over and refund me, but i don't wish to make it so inconvenient for anyone of us.

Or should i just take to NA ask mr chan if he knows how to remove?