With little holes, it is easy to release air and sink to the bottom. Open the lid and push the fishing line into the stomata base. According to the snail's habits to induce snails to the catcher, will not do harm to fish and plants. Reduce the impact of fish on the fish tank to maintain the ecological balance of the fish tank. Plastic snail trap catcher according to the snail living habit design. Easy to install, easy to operate.