In tanks with small opennings for fittings(sullivan, hayes, du-bro) I always use the neoprene, setup the same Joe does it above and it works great. In tanks with larger screw on lids, like Bennett, 3W and others, I use Aerotrend, or any Tygon equivilent, since I can use the heavier filterclunks that won't fit inside the small tank opennings of the other brands. Even when problem free, I still usually inspect and/or replace lines everyother season so either material for the lines would suffice.</p>