[1 2 Restrict the passage of gases, vapors and flames at atmospheric & . z pressure and normal ambient temperatures. ow 2 Cal-Blue Double-Coat Sealing Fittings 3 # Prevents per-compression or “pressure piling” in conduit systems 8 = Gray iron alloy body construction coated with nominal .002° 2 {2 limy blue urethane on bath interior and exterior & = Nominal .040" (40 mil) PVC coating bonded to exterior — = available in gray, white.