Introduction: Double Redstone Piston Door
Here is how to make a double redstone piston door
Step 1:
Dig a hole 6x4x2.
Step 2:
Put a block in each corner, and on top of that a redstone torch. Then connect the blocks the long way, and in the middle like the picture.
Step 3:
Fill in the floor.
Step 4:
Put a block on the redstone torches, and redstone dust on top of those blocks.
Step 5:
Put the sticky pistons next to each block with the redstone, and one more on top of each one. Then fill in the space between them with a block.
Step 6:
Completely hide the redstone, and you're done!