From Pathfinder #157: Devil at the Dreaming Palace, which isn't enabled.

Plunger Chute

HAZARD 3

Stealth +12 (expert)

Description A trapdoor in the floor conceals a hidden chute, and a moving section of wall shoves victims into it.

Disable DC 23 Thievery (expert) to jam the trapdoor shut or activate a hidden bypass switch by twisting a fitting on the gas lamp

AC 22; Fort +14, Ref +8

Hardness 10, HP 40 (BT 20); Immunities precision, critical hits

Pitfall and Plunger

Trigger A creature walks onto the trapdoor

Effect Anyone within 10 feet of the room's northern wall falls 40 feet down the shaft to area E33, taking 20 bludgeoning damage and landing Prone in the ochre jelly's pit.

The victims can Grab an Edge to avoid falling.

The DC to Grab an Edge is 20; the DC to Climb the walls is 22.

Pathfinder #157: Devil at the Dreaming PalaceOGL