I have a vent line that's more like garden hose and a 2" pipe that's regular PVC, nothing special. If it's the regular PEX line I agree with downtheroad, those sharkbite fittings are the way to go and everything for that can be bought from Home Depot for a lot less than most RV stores.
Don't take life too seriously, it's not permanent.
06 Weekend Warrior FSC3200, Axles flipped, Bridgestone Duravis Tires
2005 Ford F250 PSD 4x4
07 Yamaha YZF450 White/Silver, 94 Husqvarna WXC610
2008 Polaris RZR 800, 2011 Honda CBR1000RR & one Goffin Cockatoo