Polyvinyl Chloride
Polythene Vinyl Chloride
Phosphorous Vanadium Carbide
Plastic Very Compact
Gate valve
Ball valve
Check valve
Stop valve
13, 11
12, 12
8, 16
none of these
1/52
9/52
1/2
1/4
Silt traps
Gully traps
Intercepting traps
Anti-D-traps