Needle Valves with Straight Body. These valves are built for service up to 1,500 lbs., although wall thicknesses are sufficient to withstand much higher pressures. Each valve has a replaceable PTFE tip on the end of the stem and replaceable O-ring packing of synthetic material. The packing is located between the fluid chamber and the thread of the valve stem and bonnet so the thread can be lubricated. Full flow valves have a large hole through the body for fast flow where close control is not necessary. Fine flow valves have a small hole through the body for close control. All valves listed have 18-8 stainless steel stems, bonnets and hand wheel pins. Valves with suffix "SS" have 18-8 stainless steel bodies. M=Male, F=Female.