5.1 Making the rubber washers.
Rubber washers are used to seal the inlets each side of the tank wall. These are made in the following way:
1. Mark the inside and outside diameter of the washer on the rubber, drawing around the fitting.
2. Use scissors to cut a washer from the rubber
You will need 4 normal rubber washers and 2 thicker washers for the inlet, and one normal washer for the
outlet. It is important for the Feedstock Inlet to be water tight. This should have two rubber washers on
each side of the tank wall. A third washer made from a thicker, spongier rubber is also necessary (on both