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Old 02-27-2020 | 02:49 PM
  #6  
Dave Wilshere
 
Joined: Jun 2002
Posts: 13,269
Received 793 Likes on 576 Posts
From: Watford, UNITED KINGDOM
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If it’s the old rectangular GSU it will be Manual Red button
You need Festo tube ideally. Sounds like you have retract tube