Leak Free Compression Fittings for instrumentation process and utilities for Offshore and Onshore applications. CPI Single ferrule and A-Lok Twin ferrules fittings with patented Suparcase ferrule increase the corrosion resistance capability. Material Available in SS316, 6MO, Super Duplex, Alloy 400, 825, 625, Hastelloy C276, Alloy 600, and Titanium.