Question

i have a assignment to make a model of hydraulic arm with syringes but when we press it it works good but when we pull it air bubbles come inside and from the other side whole syringe handle doesn"t comes out what can i do ?

Answer 1

You can check for any leaks and at joints {Between syringes and pipes } you should apply MSEAL or any other bonding agent . If still doesn't work try using glass syringes  instead of plastic ones .
Best of luck !