Water, oil and dusttight enclosures are used indoors or outdoors in areas where the enclosures may be subject to hosing or to water coming from any direction or for protection against dust, dirt or oil splashing. The 5412 ES are made from quality 14 or 16 gauge steel with corner seams continuously welded. The opening has a curled lip around all sides to prevent dripping water from entering the enclosure when the door is open, it also increases rigidity. A high quality robotically poured-in place seamless gasket ensures a complete and durable watertight seal. The pins of the concealed hinges can be pulled out to remove the door. A 1/4 turn locking mechanism (or 3 point latch system on larger enclosures) ensures positive closing. Internal mounting holes are provided.