I use a 30/lt machine with a single feed I have a couple of pumps at 40lt/min that are set up for single feed. It you use the correct bore supply hose with the matching bore fitting then single feed is fine. But I often see hydraulic fittings that have a much smaller internal bore size, this is because they need to be rated for a very high pressure rating, but supply hose is not under pressure, so you could use plastic or brass fitting which internally is much wider