Minecraft Wiki
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X
W
S
F
O
M
R

A cut-away view for a single section of my sand lock. Place the sand blocks against the X-marked block to activate the section.
The F-marked block represents the floor level.
The S-marked water block is the water source.
The M-marked block is where the last piece of sand must be to trigger the output.
The R-marked block is a secondary input to reset the system.
The O-marked block is the output.
The W-marked sign is the "overflow output", attached to a chain of signs to block the output on the far end.

The Redstone Torches are where the regular Torches will be.

Iron Bars are for allowing some sand items to fall through; they are not necessary.

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