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That's what I was thinking, a heater hose would be ok? Also please forgive me if this is a dumb question but I'm highly uneducated on catch cans. But would one go between the oil separator and pcv? So a hose going from the oil separator to catch can, then a hose from catch can to pcv valve?Oof, that's a tough one... Since there's no pressure you can use 3/4" heater hose to go between the two points but you will need to re route it since nothing will make those tight bends.
Hose needs to be 3/4" ID and has a pressure of maybe .1psi, clamps in general are optional at that point, one on each end isn't a bad idea though. Hydraulic hose is usually steel braided in the inside and doesn't like to clamp or bend tight either but if you do bend it it won't kink though...Measure Inch\MiliMeter ID of the old hose.
At your favorite parts counter, ask for Oil\HydraulicRated Hose & 4ea WormClamps (to DoubleUp)
Reroute as needed to not kink.