Just Redstone Waterlog

The mod lets redstone components such as torches, repeaters, comparators, levers, buttons and pressure plates be waterlogged. Blocks that Minecraft does not normally allow to be waterlogged are shown through interactive holograms. Because waterlogging is handled on the server, the effect is not fully identical to a vanilla block on every client, and some visual compromises remain.

The mod runs on the server only, so players join without installing anything. Two forms exist: the mod itself, and a plugin for Paper, Spigot and Bukkit. The plugin is a separate project with its own technical limits, and its version tracks the mod's version. Bedrock players who join a Java server through Geyser can use the plugin's waterlogging features, and the author notes that Hydraulic may later allow Bedrock players to use the Java mod directly. Files are released for Fabric, Forge, NeoForge and Quilt across 1.14 – 26.2, under All rights reserved, and the project is not open source.