Do It Yourself Plumbing Full Contact Fittings
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This progressed the hydraulic fitting to a full-contact fittings that required flareing the line to form a taper. A nut, or (as shown) a nut with a tapered collar equipped with the same taper, slips over the line and supports and seals the flared line by wedging the line against the flare on the fitting with the torqued nut pressure. There are two different flares used in the industry: a 45- and 37-degree sealing surface. The 37-degree fits into smaller fitting bodies, but neither one provides a better seal over the other. View Related Article
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