The Monument 358J Deep Box Immersion Spanner is a specialist plumbing tool designed for installing and removing immersion heater elements with precision and ease. This professional-grade spanner features an octagonal box ring at the base of a robust steel cylinder, providing a secure grip on immersion heater nuts in even the most challenging installations. The deep box design is particularly valuable when working with immersion heaters that are surrounded by insulation or recessed into tight spaces, allowing full access where standard spanners cannot reach. The tool is supplied with a separate tommy bar, giving plumbers the leverage needed to loosen or tighten heater elements that may have been in place for years. Ideal for domestic and commercial plumbing work, this immersion heater spanner is suited to both new installations and maintenance tasks where existing elements require removal. The steel construction ensures durability for regular professional use, whilst the box-type design