Thank you very much for the feedback on our T/S-603 1-1/4 in. PVC FPT x FPT True Union Ball Valve. We are sorry it did not work in your application. The T/S-603 is made of PVC (plastic) and therefore not compatible at all with copper solder systems or any tools, components, and/or accessories used in solder applications, such as the “Jet Swet”. The Legend T/S-603 1-1/4 in. PVC FPT x FPT True Union Ball Valve is in fact a “full port” valve by industry standards (MSS SP 110). Although, the internal diameter (ID) of the valve is smaller than the ID of the tubing, this is allowed per the standard and necessary to in order to make the valve body thick and strong enough to handle the stresses of threaded connections. If we can be of any further help, please contact us at www.legendvalve.com