Actually, finding beer line that doesn't cause any
off-taste at all has turned into a much large project than I thought...
I've gone through 5-6 types now. Seems pretty much all vinyl line (PVC) causes some 'plastic' taint if the beer sits in it long enough no matter what unless it's got a glass-like barrier in it (what's they call "barrier tubing" in the industry). Barrier tubing's usually used for setups where the lines aren't 100% dedicated to a certain beverage. You can actually go from pop -> milk -> cranberry juice without any cross-taints as long as you flush the lines in-between.
I tested by leaving water in each hose/tubing type (not connected to anything) for 24-48 hours and then tasted and compared to just regular tap water:
(1) Original morebeer.com 3/16" generic clear vinyl hose (defective): Horrible plastic taste, even after only 2 hours. Definitely defective (as morebeer.com stated). There's no way anyone would find this acceptable.
(2) Sample of: Arrowhose.com 3/16" type 14 clear vinyl hose used by many places
: Still some taint. Less than above. Probably what most people use or are used to. A local draft installer in town here has 700 installs in place with this stuff.
(3) Second sample: Arrowhose.com 3/16" type 14 clear vinyl hose
: Still some taint just like above. I wanted to try a second piece just to be sure. Different run. Tastes the same
(4) Sample of Arrowhose.com 1/4" type 58 poly tubing with "arrow guard" barrier
: Very subtle plastic taint. Much less than all above. Likely adequate, but the 1/4" won't work for me. I need 3/16" (hard to find).
(5) Sample of Kuritek.com 1/4" Bev-seal Ultra Series 235 poly tubing with barrier
: NO plastic taint at all! None! Nada! Fantastic stuff! But again, 1/4" won't work. I need 3/16" which turns out is IMPOSSIBLE to find since Kuritek actually doesn't make it in 3/16" even though their web site says they do! (I called all talked directly to their engineers) <sigh>
So while (5) is best, it can't be bought in 3/16". So I ordered 50' of item (4) instead. Got it today. It's the wrong stuff!
It's not arrowhose "type 58", it's arrowhose "type 5C" grey poly tubing from 2001 without any barrier at all. The guy grabbed the wrong thing off the shelf. I'll try it anyway.... while they re-ship the other stuff.
I tell ya, this is not obvious.
I *also* have some Simgo.com generic 3/16" vinyl hose to test since the sent me the wrong stuff too! I had asked for Kuritek Bevlex Series 200 Clear PVC tubing
(no barrier but I thought I'd try it since the Kuritek guy I talked to uses it in his own home bar). So they'll be sending me that as well. More tests...!
All together I will have tested 9+ different types. Sheesh. In the end, it's just easier to pour off the first 2 ounces I think. I've gone waaaay too far with this and have become waaaay too much of a hose/tubing vinyl/poly expert.