Missing filling nozzle. Scruffy packaging. See photos. This Sentinel Leak Sealer is a must-have for your storage tank water heater. It is designed to provide a tight seal against leaks, ensuring that your water heater operates efficiently and without any interruptions. The sealer is suitable for use with Sentinel brand water heaters and can be easily applied to the tank. This 300ml bottle of sealer is an essential addition to your home heating and cooling system. It is a high-quality product that will provide long-lasting protection against leaks. With this product, you can enjoy peace of mind knowing that your water heater is operating at its best.