[ReefKeeper64]

Originally Posted by slief

It is going to depend on the heads you have. If you have Easy Load heads, then you want the norprene type tubing as it’s the most durable. There are different size tubing and different heads support different sizes. Ideally your pump would support LS17 tubing. If it were me, I would go from LS17 tubing to John Guest fittings and then use 1/4” RODI type tubing. For that combo, this is what you would need.
Several feet of this tubing. Each head needs about 8-10” but you want to have spare so you can swap tubing every 4-6 months or as needed based on how much water you are changing which impacts the amount of wear on the tubing.

LS17 equivalent tubing. Note, that is is for easy load heads that support LS17.
http://www.usplastic.com/catalog/item.aspx?itemid=25534

Qty 4 1/4” x 1/8 John Guest fittings :
http://www.usplastic.com/catalog/item.aspx?itemid=42009

Qty 4 1/4” x 1/8” barb fittings:
http://www.usplastic.com/catalog/item.aspx?itemid=36204

Qty 4 snap rings:
http://www.usplastic.com/catalog/item.aspx?itemid=34082

Hey Slief, Thanks for these links. This is most helpful. I checked and the pump heads support LS17 (1/4" inner diameter) tubing. They also support the slightly larger LS18 (5/16" inner diameter) tubing.
Should I consider the LS18 tubing since this is for water changes? I figure the fewer RPMs needed, the better. Perhaps 17 just works better for water changes with regards to vacuum or something along those lines?