@kgough wrote:
Check out the photo on this website – No need even to buy a t-piece.
You’ll need a T-piece if you only have a single bung in the tank, as is usually the case for the front tank of a Mk II!
FWIW you can find more information about buoyancy tests on the Parkstone Wayfarer website: http://www.parkstonewayfarers.org.uk/BuoyancyTestingDry.html
Richard