minetest.register_node("tmnt_sewers:water_tunnel_oppening", {
    description = "Sewer Tunnel With Water Source",
    tiles = {"SewerTunnelTop.png", "SewerTunnelTop.png", "SewerTunnel.png"},
    walkable = true,
    pointable = true,
    diggable = true,
    buildable_to = true,
    is_ground_content = true,
    liquidtype = "source",
    liquid_alternative_source = "tmnt_sewers:water_tunnel_oppening",
    liquid_alternative_flowing = "default:water_flowing",
    groups = {liquid = 3, puts_out_fire = 1, cools_lava = 1},
    sounds = default.node_sound_water_defaults(),
})