1. A septic tank riser is essentially a large tube that extends
from the lid of the tank up to the surface of the ground. Once
installed it will provide quick access to the septic tank that's
easy to find any time there is a problem or it needs to be pumped
out.
2. PVC and polyethylene risers are lightweight and easy to
install. They are resistant to corrosion and of course will not
rust. They also incorporate a gasket seal to keep water from
entering and prevent sewer gases from escaping from a leaky
lid.