The gate for the Nutty Putty Cave was designed and installed by Jon Jasper and a whole host of willing volunteers. The goal for the gate is to keep the untrained and unequipped out, yet allow for easy access by those willing to register and obtain the FREE permit.
Here is the Nutty Putty gate looking at is as you approach from the outside. Those familiar with the cave will realize that this is located after the first dive through the water puddle and mud and at the end of the first long belly crawl before the first room. This gate is not visible from the exterior of the cave.