1: View tank from above and use marker to place 2 lines opposite each other as indicated above.

2: Ensure there is sufficient access to drill 2 holes for the tanklok shaft where you have marked. Reposition marks if space is restricted. Eg Adjacent walls

3: Now view tank from the side and contine 2 lines down to bottom edge of lid. Place a horizontal mark on side of lid as indicated ensuring that there is sufficient material overlap between the sides of the lid and the access hatch up-stand . Repeat on other side. These are the centre marks for drill hole.

4: Drill through the lid and tank on both sides using the provided 17mm drill bit provided. (Ensure you press the lid in position firmly whilst drilling)

5: Slide Tanklock shaft through holes and complete the assembly as indicated above.

6: Add provided rubber washers if required to allow clamp to be positioned adjacent to the nearest locking hole