[killernoodle]

Copper pipe is pretty permanant though and makes the system difficult to remove without bending and kinking the pipes permanently. I would recommend using a pvc pipe resevior with proper end caps and proper pvc glue, and all barbs of the plastic variety. These tend to leak less and seal around hose barbs better. Also, going with some kind of epoxy on all the threads of the fittings would also be a great thing.

The best type of resevior hooks directly to the pump inlet with the max diameter fitting allowed for the pump. There is less cavitation with this type of setup because there is less restriction on the pump inlet. solid copper waterblocks are great for saftey, but you sacrafice the ability to take it apart and clean it periodically. 2 copper halves with a properly machined o-ring is your best bet. The less plexi in the system the better, especially when using extreme mounting pressures or any drag from the lines.

Good solid pumps are a must, especially something overbuilt like the danner pumps. They have an O-ring that some people claim to leak; a problem easily solved by a generous amount of petrolium gelly on the ring. This keeps the ring "wet" while also repelling water, a property common with all non-polar substances (oil based). It is far better than gooping it permanantly and makes much less mess. Also, you never want to overtighten your fittings. This will increase the chance of a crack forming if you have a polycarbonate or acrylic topped block.