Pigs require large amounts of water to stay properly hydrated. Pigs technically can drink out of buckets, but their large snouts and recessed mouths make it difficult. Because of this anatomical limitation, many farmers elect to install PVC bite-valve waterers in their pig pens. A bite-valve PVC waterer is a large vertical PVC pipe with a refill port at the top and a bite-valve drinking port at the bottom.
Purchase a large-diameter PVC pipe; the exact size you need depends on how many pigs you have. A large pipe will hold more water than a smaller pipe. Many pig waterers are between 8 inches and 10 inches in diameter and between 4 feet and 6 feet in height. Purchase two end caps and PVC cement.
Measure a 6-foot segment of PVC pipe using a tape measure. Mark the spot with a permanent marker. Cut the segment free using a hack saw. Discard the unneeded section of PVC pipe.
Paint PVC cement on the inside of a PVC end cap, then slide it over one end of the 6-foot PVC segment. Repeat on the other end. Allow the end caps to dry for the duration listed on the back of the PVC cement canister.
Measure the bite valve's diameter. Select a drill bit slightly smaller than the valve, and insert into your drill. Drill a hole 6 inches from one end of the PVC pipe. Place the bite valve against the hole, and tap it gently with a hammer until it is fully inserted. Seal the edge with silicone and allow it to dry.
Drill a hole in the top of the end cap opposite the bite valve; this is the end that will face upward when the waterer is mounted.
Lean the pig waterer against a fence post inside the pig's pen, and tie it into place using chicken wire or thick straps. The bite valve should be on the bottom and facing outward for the pigs to access. Insert a garden hose into the hole in the top end cap, and fill the pipe with water.