I use 1 inch spaflex tubing for the overflow and 3/4 tubing for the return pipe. I've had rigid pvc back then but i found that it was too difficult to disassemble. After I switched to flexable tubing and it has worked wonders for me because i can blend them and twist my pump off without troubles. I dont have clear tubes so alage wasnt a problem, as for the adapter, I just glued my tubes to my bulkheads and my stock return pump adapter. The only thing I would suggest is to use the purple primer along with the gray pvc cement to help melt the tubes to the bulk heads to prevent any cases of leaks. As fa as your adapter goes it would restrict flow to some degree, wouldnt be that great for a return pump since it will decrease water output.
Stanley,
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