| Special products 
                    •Metalworking• series 4000
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 Cover PTL540 for ozone or alum   PRETAL cover PTL540 , were developed for very high corrosionapplication.  They  are fabricated from stainless steel and the
 frame 
is to be cast in concrete. To obtain the maximum seal, the
 cover is bolted to the frame and a EPDM 
 seal is glued to the leaf
 and rests on the frame.
  Drawing  cover PTL540   Complimentary Stainless Steel 316 accessoriesfor the Ozone cover
 
                    
                      Ladders PTL100 Safety posts PTL130  Retractable ladder PTL120Hand guide PTL125 Crinolines PTL140  Required specifications The ozone cover  shall be  made from AI316__ AI304__ asprovided by PRETAL standards and  the size being specified
 on the plans.
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