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Help with Gas Fittings specifications:

Size
           
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   Metric         
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   English Size         
   Search Logic:      User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.
   Metric Size         
   Search Logic:      User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.
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Type
           
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   Tube Fitting       A tube fitting connects two or more ends of tube. The definition of a tube is a hollow cylinder that is used to transfer liquids or gases. Tubing is generally defined by the outside diameter and is fairly rigid in structure.  
   Hose Fitting       A hose fitting connects two or more ends of hose. The definition of a hose is a hollow cylinder that is designed to transfer liquids and gases and is flexible in structure. Along with a flexible structure, a hose fitting has flexible use, meaning the fittings are not permanent.  
   Pipe Fitting       A pipe fitting connects two or more ends of pipe. The definition of a pipe is a hollow cylinder that is used to transport material from one point to another. Generally, a pipe is defined by the inner diameter distance and is rigid in structure.  
   Quick Coupler       A quick-action coupler is used in a hydraulic or pneumatic system to quickly connect lines without losing fluid or fluid pressure. All couplings consist of two mating halves: the plug (male) and the coupler (female). Couplers can be used under a variety of pressure and temperature conditions. Quick-action couplers are ideal for use in applications where fluid loss during connection or disconnection is undesirable. Typical applications include systems where tools or other devices are routinely connected and disconnected to a central pressure supply. 
   Bulkhead Fitting       Bulkhead fittings are designed to be mounted in a wall or bulkhead to allow tube connections on either side of barrier. 
   Elbow       The fitting has an elbow configured for a 45° change in direction. 
   Cross / 4-Way       The fitting has four connection ports, typically in the shape of a cross. 
   Tee       Tee fittings have three-ports and are in the shape of a "T".  Standard configuration (equal) indicates that the straight-through path (typically called the run) and the perpendicular section (branch) all have the same size ports. 
   Union       Union fittings have three-parts that connect two pieces of tube and allow for disconnection without cutting. 
   Wye       Wye fittings have three-ports in the general shape of the letter "Y," or in which a branch departs the run at an angle other than 90°. The designation "equal" refers to the three outlets being the same size. 
   Adapter       Adapters are fittings designed to connect different types of hose, tubing, or pipe together. 
   Reducer       The fitting reduces in size. Example: inlet is 1/2 in. and the outlet is 1/4 in. 
   Nipple       Nipple is a common description of a short, straight connector fitting, typically with male threaded ends. 
   Swivel       The swivel feature allows one or more fitting ends to rotate or swivel. 
   Coupling       A coupling is a device with female connections that connects two identical sections of hose, tube, or pipe. 
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Material
           
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   Aluminum       Aluminum is a bluish, silver-white, malleable, ductile, light, trivalent, metallic element that has good electrical and thermal conductivity, high reflectivity, and resistance to oxidation. 
   Brass/Bronze       Brass is an alloy of copper and zinc, often with additional elements such as lead or tin. It is characterized by good strength, excellent high temperature ductility, reasonable cold ductility, good conductivity, excellent corrosion resistance, good bearing properties, and low magnetic permeability. 
   Composite (Carbon/Fiberglass/Graphite)       Carbon or graphite has an extremely high melting point and is resistant to many molten non-ferrous metals, ceramics, and salts. Carbon pipe is used in chemical manufacturing, in heat treating furnaces, in non-ferrous metal production, and by the ceramic industries. 
   Ceramic  (Carbon/Fiberglass/Graphite)       Ceramic materials are made of metal oxides, carbides, nitrides, or combinations of these compounds. Ceramics are typically formed from powders consolidated in a high temperature firing process. Most ceramics resist high temperatures and chemicals, but they typically have low electrical and thermal conductivity. 
   Copper       Copper is a common reddish, metallic element that is ductile and malleable. It is one of the best conductors of heat and electricity. Copper tube and fittings are frequently used in plumbing applications. 
   Exotic Metals       Exotic metals and alloys have specialized properties. This category includes materials such as Hastelloy®, Monel®, beryllium copper, beryllium nickel, niobium, tantalum, titanium, and zirconium. 
   PVC/CPVC       Polyvinyl chloride (PVC) and chlorinated polyvinyl chloride (CPVC) are common, versatile pipe materials. CPVC shares many of the advantages and application use with PVC, and typically carries higher temperature ratings. 
   Fluororesin (PFA/PTFE/PVDF)       Perfluoroalkoxy (PFA) is used for temperature requirements of 500°F (250°C). This material exhibits very good chemical resistance and dielectric properties. 
   Glass       Glass properties include smoothness, nonconductivity, relative inertness, and resistance to acids and other corrosive media. Its chemical resistance makes it suitable for many chemical processing applications. 
   Iron (Cast/Ductile)       Ductile iron is a form of cast iron developed in the 1940s that incorporates significant casting refinements, additional metallurgical processes, and superior quality control. The heat treatment after casting nodulizes the graphite into spheroidal shapes, giving ductile iron greater elongation, impact strength, and toughness than its predecessor, gray cast iron. In fact, the properties of ductile iron resemble those of steel more closely than traditional gray cast iron. Ductile iron retains the machinability of gray iron, and its high corrosion resistance is often enhanced with polyethylene encasement. Also called "nodular Iron" or "S.G. iron". 
   Rubber / Elastomer       Several elastomeric products can be used in pipe fabrication; the most widely used is neoprene, a synthetic rubber that resists degradation from sun, ozone, and weather. It performs well in contact with oils and many chemicals. Neoprene remains useful over a wide temperature range, displays outstanding physical toughness, and resists burning inherently better than exclusively hydrocarbon rubbers. Neoprene also offers resistance to damage caused by flexing and twisting. Suggested operating temperature is -45° to 230° F. Neoprene was originally engineered by DuPont Dow. 
   Polyethylene (PE)       Polyethylene (PE) is a semi-crystalline (typically around 50%), whitish, semi-opaque, commodity thermoplastic that is soft, flexible, and tough, even at low temperatures. PE offers outstanding electrical properties, but poor temperature resistance. It also has very good chemical resistance, but is prone to environmental stress cracking; it has poor UV resistance (unless modified) and poor barrier properties, except to water. 
   Polypropylene (PP)       Polypropylene (PP) is a thermoplastic material that exhibits excellent cold flow, bi-axial strength, and yield elongation properties. It is similar to PVC, but can be used in exposed applications because of its resistance to UV, weathering, and ozone. 
   Carbon & Alloy Steel       Steel is a generic classification for general purpose carbon steel, mild steel, or steel alloys containing additions of chrome, nickel, molybdenum, vanadium, or other elements to alter hardenability characteristics, toughness, hardness, corrosion resistance, and/or strength. "Black pipe" is typically made of carbon steel. 
   Stainless Steel       Stainless steel is chemical and corrosion resistant, and can have relatively high pressure ratings; this selection includes all grades of stainless steel. 
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