Curb Extensions GPE GPEX ATE VCE ISB × GPE A curb extension providing additional height to a standard curb. Model GPE features an access door to provide easy access to a damper and damper actuator. 12 to 24 in. heights Purchase Options: REQUEST A QUOTE Configure to Order Need a specific configuration? Submit a request online and get a quote from your local representative within 4 hours. REQUEST QUOTE