From Lamai: Stay on the ring road direction Nathon. Approximately 1km past the Na Muang Waterfall, turn left onto the concrete road. Hash sign will be there.
From Nathon: Stay on the ring road direction Lamai. Before the waterfall, shooting range there is a quarry. You will see the hash sign on your right, onto the concrete road.
For both: Stay on the concrete road for approximately 2km, till you get to the end. Follow the Hash sign to the right and carry on for approximately 1km. You will see the piss truck.