CHAMBERLAIN LIFTMASTER LM750 EV GB ROLLER DOOR OPENER. CHAMBERLAIN LIFTMASTER LM750 ROLLER DOOR OPENER. Supersedes the models LM650 and RDO800. This new garage door opener from Liftmaster exclusively suits residential roller curtain garage doors. The motor unit is mounted directly to the existing roll shaft and a forked device engages with the spoked wheel within the roll to provide the motion.If you have any questions or require any advice please do not hesitate in giving Sean Hall a message on our store. Address: Sean Hall Genesis House Priestley Way Crawley West Sussex RH10 9PR United Kingdom. Need to get in touch? This item is in the category "Home, Furniture & DIY\DIY Materials\Garage Doors & Openers\Other Garage Door Equipment". The seller is "onlinegaragedoorspares" and is located in this country: GB.