The main pieces of equipment for this experiment are a horizontal steel pipe packed with sand, tubing, gas cylinders and regulators.
(The main pieces of equipment for this experiment; are; a horizontal steel pipe packed with sand, tubing, gas cylinders and regulators) (a horizontal steel pipe; packed; with sand, tubing, gas cylinders and regulators)
The main pieces of equipment for this experiment a horizontal steel pipe
are packed
a horizontal steel pipe packed with sand, tubing, gas cylinders and regulators
with sand, tubing, gas cylinders and regulators