Professional Pipe Fittings:The fitting is strength, low carbon content (brass is too flimsy and will broke in use), which can be connected to copper, brass, plastic, aluminum, and welded steel; Can use widely for fuel equipment, plumbing, gas, refrigeration, and vacuum applications, it also good for any home brewing applicationEven in humid environment, it still has strong oxidation resistance and does not corrode.Stainless steel can withstand high temperatures as well as low temperatures.Specification:Material: Stainless SteelThread: M30x1.5Length: 19mm / 3/4"Color: Silver ToneWorking Temperature: -100 to +660 degrees ℉Key Installation Steps:1. Seal: Apply tape (2-3 clockwise wraps) or sealant paste to nipple threads.2. Hand-Tighten First: Screw connector into first fitting by hand until snug.3. Wrench-Tighten First: Hold fitting, turn connector 1-2 full turns past hand-tight (avoid over-tightening).4. Seal & Hand-Tighten Second: Apply sealant to exposed adapter threads. Hand-tighten second fitting.5. Wrench-Tighten Second: Hold adapter, turn second fitting 1-2 full turns past hand-tight.Check Alignment: Ensure pipes/fittings are straight.Pressure Test: Test system for leaks (e.g. soapy water) before use. Never test gas lines without a professional.Tools: Two wrenches, tape or sealant paste.Crucial: Use sealant. Avoid over-tightening. Pressure test is essential.Packing Includes:1 Pc Hexagon Socket Plug With External Thread