POLYVENT HEAVY DUTY TANK LIDS 
The quick and easy way to inspect, clean and fill water and fuel tanks. Polyvent is a heavy duty watertight tank lid which has these advantages over conventional lids: 
  -   It is completely transparent. To find out if the tank needs filling or cleaning, all you have to do is look
  through the lid.
 
  -  It unscrews. So when the tank needs filling or cleaning, you can take
    the lid off in a few seconds and replace it just as quickly when the job
    is done.    
 
  - Tanks fitted with Polyvent lids are easily topped-up with a hosepipe or
      can. No dock pipes or vents are needed. 
 
 
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