Fire Sprinkler

A button placed on the underside of a block that holds water becomes an armed sprinkler. It stays inert until a fire starts in the spray cone beneath it, then the water falls like rain and the fire goes out with the usual extinguish hiss and puff of steam. Mobs that walk through the spray stop burning. Because the sprinkler only activates on fire, the water it produces has no other effect on the world.

The spray widens as it falls, forming a confined square of 11 by 11 blocks. It drops straight down and reaches only the solid floor directly beneath. Any solid block above the sprinkler's level stops the water, so roofs, full blocks, slabs, stairs, fences and closed trapdoors all block it. Spray passes through open trapdoors, string, torches, carpets, flowers, and any block holding water or waterlogged.

The mod is published for Fabric and NeoForge, with builds for 26.1.2, 26.2 and 26.3, and is open source under the MIT License. Client-side water drips can be avoided by placing the water supply in a different way, for example by waterlogging a grate or a leaf block two stone blocks above the button.