Octagonal Pvc Ball Valve

ball valve
any valve that checks flow by the seating of a ball
(Ball Valves) Contains a slotted metal or plastic ball that aligns with the hot and cold water inlets when rotated by the faucet handle. Ball valves are reliable but tedious to fix. A metal valve is more durable than plastic under most circumstances.
A ball valve is a valve with a spherical disc, the part of the valve which controls the flow through it. The sphere has a hole, or port, through the middle so that when the port is in line with both ends of the valve, flow will occur.
A one-way valve that is opened and closed by pressure on a ball that fits into a cup-shaped opening

octagonal
octangular: of or relating to or shaped like an octagon
Octagonal (foaled 1992 in New Zealand) is a retired champion Thoroughbred racehorse, also known as 'The Big O' or 'Occy'. He was by the champion sire Zabeel, out of the champion broodmare Eight Carat, who also produced Group One winners Mouawad, Kaapstad, Diamond Lover and (Our) Marquise.
(Octagons) In geometry, an octagon (from the Greek okto, eight ) is a polygon that has eight sides. A regular octagon is represented by the Schlafli symbol {8}.

pvc
polyvinyl chloride: a polymer of vinyl chloride used instead of rubber in electric cables
premature ventricular contraction: irregularity of cardiac rhythm; recurrent occurrences can be a precursor of ventricular fibrillation
Polyvinyl chloride
Polyvinyl chloride, (IUPAC Poly(chloroethanediyl)) commonly abbreviated PVC, is a thermoplastic polymer. It is a vinyl polymer constructed of repeating vinyl groups (ethenyls) having one of their hydrogens replaced with a chloride group.