The tank filling pipe can also be sealed airtight by {TAIL ~ the closure flap} or by {HEAD ~ a closure valve} arranged in the tank filling pipe 
The tank filling pipe can also be sealed airtight by { TAIL ~ the closure flap } or by { HEAD ~ a closure valve } arranged in the tank filling pipe
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH