The 75 and ZT Owners Club Forums - View Single Post - How To Understand Pressure Caps and Header Tanks

Mike Noc · 22nd May 2016, 07:44

Great work TC. One thing puzzles me - what is the purpose of the lower O ring on the cap, given that the vertical channel into the tank appears to bypass it?

22nd May 2016, 07:44	#10
Mike Noc This is my second home Rover 75 CDT Manual Connoisseur SE, Rover 75 CDT Automatic Connoisseur SE & a Freelander Td4. Join Date: Jul 2009 Location: Hampshire Posts: 11,558 Thanks: 3,470 Thanked 3,119 Times in 2,247 Posts	Great work TC. One thing puzzles me - what is the purpose of the lower O ring on the cap, given that the vertical channel into the tank appears to bypass it?