Compressed air technology
Compressed air technology for connections, lines, and work tools: couplings, compressed-air hoses, distributors, wall outlets, sealing tape, and blow guns are selected by connection type, hose size, and design.
Organize compressed air technology by task
Within this category, compressed air technology covers connections, lines, distribution, wall connections, shut-off valves, and accessories. The appropriate design depends on whether a hose is connected to a fitting, a line is split, a take-off point is arranged on the wall, or a thread needs sealing.
Four details help with classification: connection type, nominal size or hose size, material, and delivery form. For couplings, sockets and plugs as well as internal threads, external threads, or hose barbs are central. For hoses, the size specification and length are visible. Distributors and sets combine several connections or connect them with couplings and plugs.
Selection starts with the existing mating part: connection form and size specification are compared first, followed by material and design. A 3/8-inch internal thread is a different specification from a 13 mm hose barb; the two represent different connection types.
Couplings: socket, plug, and hose barb
Coupling sockets and plugs
Coupling sockets and compressed-air plugs form the two sides of a quick coupling. Product names include sockets with 1/4-, 3/8-, and 1/2-inch internal threads; plugs and coupling sockets are also listed with 1/4-, 3/8-, and 1/2-inch external threads. These details help with matching the existing connection.
Hose barbs are available in 6, 9, and 13 mm. A 6 mm version, a 9 mm version, and a 13 mm version are separate selection points. The coupling with a 13 mm hose barb and one-hand quick coupling is listed alongside versions with a 9 mm or 6 mm hose barb.
Operation and connection
Alongside the connection side, the product cards state the design: one-hand quick coupling, coupling socket, compressed-air plug, or brass coupling. The 1/4-inch coupling socket is described as a standard-size version with brass and an NBR seal; another card states an operating pressure of 0 to 35 bar and a temperature range of -20 to +100 °C for this coupling. Such values belong to the stated version and are not transferred to other connections.
The connection also depends on whether the hose is routed over a barb or a thread is screwed in. This distinction is more important than the general term compressed-air coupling because the category includes both construction types.
Three items as a guide
The following cards show different selection axes: distribution, hose connection, and thread sealing. The product names and the respective equipment make the differences visible.
Compressed-air distributor, 3-way brass
The distributor is made of brass, identified as a 3-way distributor, and described with a 3/8-inch internal thread. It therefore represents a distribution task with a defined thread size.
Compressed-air coupling with 13 mm hose barb
A 13 mm hose barb and one-hand quick coupling are named together here. This version therefore belongs to the hose-connection section rather than the threaded variants.
PTFE tape, 1/2 inch x 10 m
The tape is described as PTFE thread-sealing tape with a width of 1/2 inch, a length of 10 m, and a thickness of 0.1 mm. It is intended for sealing threaded connections.
Distribution and wall connections
Distributors with multiple outlets
For several lines, the category includes brass distributors, Y-distributors, and T-pieces. The 3-way distributor from the product card has a 3/8-inch internal thread. There is also a 2-way Y-distributor with a 3/8-inch internal thread, a T-piece with a 3/8-inch internal thread, and set versions with couplings and plugs. The terms 2-way, 3-way, and T-piece describe the design or the branches.
Wall sockets, couplings, and sets
Wall sockets organize compressed-air connections at a fixed mounting position. A brass wall socket is designated with a 3/8-inch internal thread. A plastic wall socket has four 1/2-inch internal threads; the product card states a maximum pressure of 15 bar. There are also wall-socket sets with one coupling, three couplings, or four couplings, as indicated in each product name.
When comparing a wall socket and a wall distributor, the number of connections comes first, followed by material and finally the thread specification. Both brass and plastic are represented in the range. Sets additionally contain the stated couplings or plugs; a single wall socket, by contrast, denotes the socket itself.
Select hoses by size and length
Reading size specifications
Individual items have names such as PVC compressed-air hose 6 x 12 mm, 25 m; PVC compressed-air hose 9 x 15 mm, 25 m; or PVC compressed-air hose 13 x 20 mm, 25 m. These specifications remain tied to the respective items; a size specification does not imply a property of the other versions.
A coupling is named with the 6 x 12 mm version, as well as with a 9 x 15 mm and a 13 x 20 mm version. Other product names list PVC compressed-air hose without the addition of a coupling. This distinguishes a hose alone from a hose with a named coupling without transferring the size from another version.
Length and material
PVC is listed as the material for the compressed-air hoses mentioned. Size specification, length, and the addition of a coupling are separate selection points. This helps match an existing line without mixing details from different items.
Threads, barbs, and material compared
Three connection types form the main axis: internal thread, external thread, and hose barb. The overview below summarizes which specifications appear in the product cards and names.
Internal thread
Coupling sockets and wall sockets are designated, among other things, with 1/4-, 3/8-, or 1/2-inch internal threads. The thread size belongs to the respective socket or wall socket.
External thread
Product names for compressed-air plugs and coupling sockets include 1/4-, 3/8-, and 1/2-inch external threads. This side is compared with the existing internal thread.
Hose barb
Compressed-air couplings with 6 mm, 9 mm, or 13 mm hose barbs form the selection for hose connections. The barb size remains tied to the specific version.
Material also separates the versions: brass is used for distributors and several couplings, stainless steel 316 for the ball valves described, plastic for wall sockets and blow guns, PTFE for thread-sealing tape, and PVC for the compressed-air hoses mentioned. For example, a ball valve is described with stainless steel 316, a 1 1/2-inch internal thread, and 64 bar. These material and pressure specifications belong to the stated version in each case.
Subcategories for the next selection step
The subcategories group connection type and product type. The cards lead to areas where the respective selection axis is sorted further. Shut-off valves, distributors + sets, and accessories are also part of the visible range.
Compressed-air hoses
Hoses as a separate product group.
With external thread
Couplings and plugs with external thread.
With internal thread
Sockets and connections with internal thread.
With hose barb
Couplings for hose connections with a size specification.
Adjacent areas in operating supplies
When other operating supplies are needed alongside compressed-air connections, adjacent categories are available in the same area. They are separated by product group and complement the search without mixing the connection types in this category.
Hardware
Additional connecting parts and fittings.
Hand tools
Tools for manual work steps.
Cable ties
Fastening material for lines.
Adhesive tapes & strips
Adhesive materials for other tasks.
Further reading
The following reading covers the selection of painting tools and accessories and adds context for work where compressed-air and hand tools occur side by side.
The title links painting work with the selection of tools and accessories.
Frequently asked questions about selection
How can I tell whether a coupling socket or a plug is needed?
The product names distinguish the two designs. For a threaded connection, an internal or external thread is also stated; for a hose connection, a hose barb with a size specification is included. The existing mating part and its connection type determine the appropriate selection.
Which hose barb fits my hose?
The specifications list 6 mm, 9 mm, and 13 mm as hose-barb sizes. The 6 mm hose connector is described with an internal diameter of 6 mm. The hose size and barb of the same version belong together; a 9 mm or 13 mm version cannot be inferred from the 6 mm value.
What is the difference between internal and external threads?
The two details describe the side of the threaded connection. In this category, 1/4, 3/8, and 1/2 inch appear for both internal and external threads. For the connection, the thread of the mating part must fit the selected side.
Which specifications matter for a compressed-air hose?
Size specification, length, material, and the addition of a coupling are key details in the names. PVC compressed-air hoses measuring 6 x 12, 9 x 15, and 13 x 20 mm are listed; the respective names state 25 m. The data remains tied to the respective version.
What is PTFE tape listed for in this category?
PTFE tape is described as thread-sealing tape for stainless-steel, steel, brass, and malleable-iron fittings as well as compressed-air fittings. One version states 1/2 inch x 10 m, while another additionally states a thickness of 0.1 mm. These values refer to the respective tape.
How do a wall socket, distributor, and set differ?
A wall socket denotes the connection at the wall, a distributor divides into several outlets, and a set names the included couplings or plugs. The specifications list a brass wall socket with a 3/8-inch internal thread and a plastic wall socket with four 1/2-inch internal threads; sets name one, three, or four couplings in each respective product name.