Tompkins Steel Adapters (Forged and Straight) are made from carbon steel. These high-quality, one-piece adapters are finished in five color zinc dichromate and value priced. Perfect for applications with working pressures up to 10,000 psi and temperature ranges of -65 degrees F to +250 degrees F. Widest availability of jump-sizes and configurations in the industry. Meets or exceeds all SAE standards.