{HEAD ~ The housing} 12 has a cup shaped design with a ventilation opening 14 arranged at one end and {TAIL ~ a valve seat} 15 arranged at the other end 
{ HEAD ~ The housing } 12 has a cup shaped design with a ventilation opening 14 arranged at one end and { TAIL ~ a valve seat } 15 arranged at the other end
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH