The correct replacement for a Demco Master Cylinder 05680-C is the Replacement Master Cylinder part #5650. I spoke with Demco to confirm this for you.

Brake systems are not dependent on the hub bolt pattern. So you can use the Electric Trailer Brake Kit #AKEBRK-7-SA for 12 inch hub/drums or #AKEBRK-35-SA for 10 inch hub/drums. Then use #10-1-1 wire sold by the foot for your brake magnet wiring.…

I agree it is the right time to upgrade to a Lithium charger/converter as not all are Lithium compatible. I recommend using the Progressive Dynamics Mighty Mini AC/DC Panel and Converter/Smart Charger - 60 Amp #PD4060K which is a replacement for…

What you need for your Isuzu NPR truck is a powered converter #C59236. It is compatible with incandescent and LED trailer lights. I have included a link to the installation instructions for you. This harness does require a direct connection to the…

To determine the size of the brake assemblies you need you have to measure the depth and width of the hub drum on the axle like what you see in the picture I attached. The most common size is 2-1/4 inch wide like the #T4071600-500 that you…

The Tekonsha OEM Vehicle Wiring Harness #22121 that you referenced includes all the wiring and parts necessary to install a fully functional 7-Way connector and trailer brake controller. The included brake controller harness is compatible with and…

A #93 incandescent bulb has a single contact bayonet base, and there are a couple of options for LED bulbs that will replace these. You can choose a bulb that gives off either a warm or cool light; I have added a photo showing the difference…

We do have a compatible grease seal for your 168255TC oil seal, however, we do not carry rubber coated seals in this size. The 168255TC oil seal was designed to work with oil bath hubs on a 3,500 lb axle. For the most part, axle manufacturers have…

From the looks of the photo you sent it does not look like you have an OEM suspension system on your boat trailer. I recommend securing the suspension rail to the trailer frame in a more secure manner like drilling and using bolts so that it does…

You do not want to use a holding tank heater like ThermaHeat #277-000164 on a battery but we do offer battery heaters specifically intended to protect one from extreme cold. You can see all such items on the page I linked for you.…

On oil bath hubs the seals are different than standard grease seals. The correct replacement for what you have is #91030. Unitized oil seals like this have a part that stays fixed and a part that rotates with the hub for optimum leak protection. I…

I am sorry Lippert did not include their instructions with your Lippert Trailair Air Ride 5th Wheel Pin Box #LC158778 but I have included a link to them on the Lippert website. I also linked an image of page 3 from those instructions which shows…