DORGARD HOLD-OPEN FIRE DOOR RETAINER RED Reliable choice for retaining fire doors, keeps the door open at any angle. Automatically releases door when fire alarm sounds. Easy to fit. Long life C batteries supplied. Suitable for holding open units up to 1600mm. Maximum Door Weight 160kg Wireless Low Battery, Auto Door Release Quick Installation Sound-Activated Door Release Night-Time Release Facility Completely Wireless
eBay