It automatically locks the spring at the maximum extension, with a simple movement it frees the sliding. This safety device is recommended to avoid that in case of rolling or pitching a door can be inadvertently closed. Body in stainless steel AISI 316. N.B. :1) By adding the block the declared length of the spring is extended by 25 mm.
2) When mounted in pairs, order extension 38.040.90.
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