id need to see some specs on McMasters hose. that tubing has a shore rating of 50, whereas tygon 3603 has a rating of 55 (so id assume the bend radius of McMasters high-flex PVC tubing to be as good or better than the 3603). that tubing also has a good temp range (max of 180+ F). it isnt clear; but it is cheaper. i dunno, grab some and try it out
ive already got some 3603 comming to me from DDen......