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In RVs, manufacturers typically use translucent non-colored PEX for all plumbing runs. Further, two sizes are used, 3/8-inch and ½-inch. These are the standard size because the outside diameter of the tubing is about 1/8-inch greater than the called-for size.
Similarly, it is asked, how does the plumbing work in an RV?
From there, a 12-volt RV water pump carries water from the freshwater tank into the plumbing system. This water pump is what gives the RV plumbing system pressure, so that when you turn on a faucet or the shower, you get running water. These little pumps are the lifeline of the RV plumbing system.
Thereof, why is RV plumbing black?
Once you open a drain or flush the toilet, there's nothing more to think about. In an RV, wastewater is collected in holding tanks by type: “gray” for the sink and shower water and “black” for sewage. The tanks are vented through the roof via a 1½-in pipe. Some RVs have more than two holding tanks.
Much like installing PEX tubing, repairing it is also an easy process. If you're using a crimp or clamp connection systems (both being very popular), using brass PEX fittings with copper or stainless steel crimp rings is the most inexpensive method of repairing PEX tubing.