Split Flange Code 61 SAE 90 Elbow 3/4 Inch X 3/4 InchNPTF fittings create a mechanical seal when a male and female fitting are mated. The female hose end crushes the thread of the male fitting, creating a tight, robust connection. NPTF fittings are known as "dry seal threads" because they don't require thread sealants, which can dissolve and contaminate fluids or gases in high temperature and high pressure applications. NPTF fittings provide a more substantial, leak free seal, but are more prone to