The second consists in putting a protective plate into place on the surface of the sheet that faces towards the pump chamber, {HEAD ~ which protective plate} is made of {TAIL ~ a high grade material} that presents good resistance to corrosion 
is made of
The second consists in putting a protective plate into place on the surface of the sheet that faces towards the pump chamber , { HEAD ~ which protective plate } is made of { TAIL ~ a high grade material } that presents good resistance to corrosion
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH