Okay I have my barbed bulkheads so in order to make things less complicated i've opted to plumb the tank using Spa Flex. My question is if im using all spaflex can I add slip ball valves and unions by just using pvc primer (the purple stuff) to glue the spa flex into the slip valve or union. In the future could this cause a problem or what? Im clueless when it comes to plumbing and need serious help here! =/