suspended ceiling grid cost per square foot
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Free the cover by levering gently round the edge with a screwdriver; take care not to bend the flange.
To prevent thelubricating oil from leaking outside even under high pressure of the oil.
ERIKS type R (type A according to the DIN standard) is identical in shape to type M, but has a rubber outer case with metal reinforcement on the inside. The rubber creates a good seal in the housing, even if the housing has suffered minor damage or is not in its best condition for other reasons. The RST version has a dust lip. These types are often chosen to replace a type with a metal outer case because they are easier to install and can cope with minor damage to the groove, such as scratches.