garage door opener 1135 vm garage door opener genie 37411v 1 2 horsepower powerlift garage door opener 1035 vm durable chain drive garage door opener garage door opener 1135 vm garage door jackshaft operator head chain garage door opener genie garage door opener 1 2 hp durable genie gcl j standard duty 1 2 hp durable chain drive garage door opener genie gcl h standard duty 1 2 hp hoist