1571

 

 

 

 

 

 

 

 

 

 

The van dorn water sampler collects a tube of water from a desired water depth. the cord holding the sampler is jerked to release the the blue rubber plunger heads and close the tube. the plunger heads are connected with rubber tubing which stretches when the tube is open and puts pressure on the plunger heads. the plunger heads will spring shut when the release mechanism is triggered.