High quality Grey Iron 8'' Galvanized Hydraulic Disc Brake Caliper 2000lbs Boat Trailer Calipers from China, China's leading Galvanized Hydraulic Disc Brake Caliper product, with strict quality control 8'' hydraulic disc brake caliper factories, producing high quality 2000lbs Boat Trailer Calipers products.designed to conduct the water to a drive pipe as shown in Figure2. The supply line, if needed, should be at least one pipe diameter larger than the drive pipe. 2. Drive pipe. The drive pipe must be made of a non-flexible material for maximum efficiency. This is usually galvanized iron pipe, although other materials cased in concrete will work ...A PVC drive pipe placed in a stream bed. Galvanized steel was not an option due to the bed topography and geometry. The hydraulic ram pump worked well, but each bend allowed a tiny portion of the shock wave to dissipate. A straight, galvanized steel pipe would have captured a larger shock wave and provided more pressure.Trailer is full hot-dipped galvanized, has a full width x 4' high ramp gate, 2-5 16 A-frame coupler, A-frame jack, safety chains, D.O.T. sealed beam lights, brakes on the front axle, wiring housed within tubular frame, cross members every 16in. O.C., 4in. drop spring axles, galvanized rims with 205 75D14 tires, 2in.x8in. spruce deck, and tie downs.