Marketing InformationSafeLet welding outlets are manufactured by SIGMA piping products from highly weldable steel which conforms to ASTM A576/A29. SafeLets are designed specifically for use with automatic welding equipment. Threads are cut in accordance with ANSI B1.20.1 national standard for tapered threads. SafeLets offer the user a high-strength, low cost, forged threaded outlet specifically designed and manufactured to be installed on proprietary thin wall "FLOW PIPE", SCH 10 and standard wall pipe.