Q 230-Q 233
Needle valves in threaded execution.

Q 234 & Q 235
Needle valves with welded ends of steel.

Q 236-Q 239
Manometer valves for shut off and replacement of defect pressure gauge.

Q 240-Q 243
Control manometer valve for control and replacement of defect pressure gauge.

Q 271-Q 274
Water syphons in steel.

Q 281-Q 284
Water syphons in stainless acid resistant steel.