Truefit Engineering Co. Ltd. Supplies Plummer Block Housings with Radial Labyrinth Seal. Truefit Engineering Co. Ltd. Holds ISO 9001:2000 quality assurance certifications. Plummer Block Housings with Radial Labyrinth Seal is horizontal split type which is available with four mounting holes of elliptical shape. Plummer Block Housings with Radial Labyrinth Seal, SDAF design is heavy duty version of SAF type. These housings have radial labyrinth seal which ensure maximum sealing effectiveness where surrounding conditions are unusually dusty. Extra heavy foot pads are provided for better bolt seating and rigid assembly. These housings are rugged in construction and can withstand heaviest loads and shocks. They are used in very heavy application like used mining, steel plant, crusher etc.