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SECO 7, AN 37 Degree Flare Seal
SECO 7 Seals can solve the most persistent leaks in your AN plumbing. They are especially indispensable when connecting flared tubing to male AN fittings with AN tube nuts and tube sleeves. They can compensate for misaligned tubing and imperfect flares.
Originally developed for NASA, the soft annealed 37 degree conical seals act as a crush washer on the male flare. They help to ensure reliable, leak-free seals while preventing damage to the tubing or the AN fitting. They can even help rescue fittings that have been damaged at the seat from debris, overtightening, or manufacturing irregularities.
Use copper seals with steel tubing and fittings or aluminum seals with aluminum tubing and fittings. Seals are sold individually. Keep some in your toolbox and be ready for the unexpected!