Wide mouth master cylinder - easier to add brake fluid. Common filler cap - easier to maintain spare parts. E-stop cable coiled PVC coated cable keeps cable from getting in the way. Quick latch 2" couple - coupler in closed position will auto latch on the hitch ball. Corrosion resistant aluminim master cylinder. Grease fittings on roller pins. Dampener built in and pre-loaded - no need to load dampener before bleeding the brakes. 6,600 lb. capacity.