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Your cart is empty.Heavy duty threaded exhaust flange for use on Harbor Freight Predator301cc & 420cc engines, GX 240, 270, GX 390... Great for custom exhaust setups on generators, go karts, mini bikes, or garden equipment. Flange is CNC cut from heavy 1/4" steel plate to prevent warping, outlet pipe is 1" pipe thread that matches exhaust port perfectly for maximum flow. Length of outlet pipe is around 2" Comes complete mounting hardware and gasket. Material type: 304 stainless steel threaded, mild steel exhaust flange. Finding the Correct Pipe Thread Size National Pipe Threads (NPT) Pipe sizes do refer to physical dimensions, but the plumbing industry standard for the sizes of pipe is not always as straight-forward as measuring the pipe. Measuring the pipe will oftentimes mislead you into choosing the wrong pipe, so do take care. The "pipe thread size" as shown in column 3 of the table below is measured and based on the inside of the pipe. But, to actually determine the size of a pipe, the outside diameter of each pipe or fitting must be measured and compared to the table for size identification. For example, a 3/4" NPT pipe thread has an outside diameter of 1.050 inches. Each thread size has a defined number of threads per inch (TPI). The 3/4" NPT pipe thread has 14 threads per inch. Both the TPI (threads per inch) and OD (outside diameter) of the thread are required for positive identification of thread size because several sizes have the same TPI.
Carrie Brincat
Reviewed in the United States on August 8, 2024
it state fits harbor freight 420 cc, no not even close.
Michael Swartz
Reviewed in the United States on September 12, 2022
The welding looks good. The steel is solid. But is obviously made in a foreign country where the thread size is not well regulated. It's so loose, the fitting I attached to it bottoms out before sealing. I tried several different fittings. It's always wobbley and loose. I even tried some high temp never-cease. It just blows it out. I will have to weld it up to seal it. The threading is just way too oversized to be useful.
MSC
Reviewed in the United States on September 22, 2021
Excellent product, quality work.Now let's discuss Amazon's lack of attention with tracking updates and delivery times. According to Amazon, this item isn't supposed to be delivered for five more days and original estimate was up to four weeks yet it showed in FIVE days
Shopman
Reviewed in the United States on May 10, 2021
Works on a Predator 420 motor if you adjust the diameter of the mounting screw holes.
Woody
Reviewed in the United States on March 2, 2020
Holes were drilled slightly off but still made it work.
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