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When dealing with 90 degree fittings, finding the right size can be confusing. At one time, the tube’s size was determined by the internal diameter of the tube. The correct method for determining the car pipe's size is now determined by the Dryseal American Standard Tapered Pipe Threads (NPTF) Guidelines of the Society of Automotive Engineers. With this system, the pipe's size is not consistent with either the inside diameter I d) or the outer diameter (od) or the thread pitch. The proper way to determine the pipe's size (up to 1 1/4-inch) is to measure the thread diameter and subtract 1/4-inch. For example, remove 1/4-inch from 1-inch thread od to obtain a nominal 3/4-inch pipe size.
Here's the situation: it's Saturday morning. You're starting a project on your car that you've been told will only take half an hour or so to complete. An hour has passed, and you're still searching through a few cups of coffee full of fittings for the last one needed to complete the chore, but nothing seems to fit. Furiously, you jam a few fittings together with enough Teflon tape to bandage your entire head, but your rod is now leaking like a juice box.
So you're off to the local garage where someone behind the counter wants to know the make, model, and year of the car, and if it's got air conditioning. Then he points you to a cabinet full of fittings, most of which are in the wrong bins, and now the challenge is to figure out what's compatible with what, so you waste even more time trying to make things screw together. We are here to guide you through the impossible task of finding the right fitting and lines for your prized possession.
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