Air passage changeover device having film screen
Al alloy poppet valve
Al or Al alloy poppet valve and a method of manufacturing the sa
Annular sealing device having a positive stop means for use...
Apparatus and method for inhibiting the leaching of lead in wate
Apparatus for sealingly enclosing a check valve
Apparatus to connect a stem to a valve member
Arrangement for fixing friction patches on a gate valve shutter
Article having a hard lubricious coating
Automatic swimming pool cleaners and components thereof