The pressure vessel is connected to the compressor via a connection nozzle located on the shell or the dished end of the receiver. If the receiver is large, or if several devices are connected to it simultaneously, it may have more than one inlet connection. This allows additional compressors to be connected, reducing the time required to fill the receiver or achieve the desired pressure.

A gas pressure vessel should also be fitted with a connection for a safety relief valve. This is most commonly installed at the highest point of the receiver. Once the pressure set on the safety relief valve is exceeded — adjusted by means of the spring setting — the air is discharged directly to the atmosphere.

Receivers are also fitted with a G1/2" female-threaded connection for a pressure gauge, which is installed via a pressure gauge cock.

During the filling and emptying of the receiver, water condenses from the air to form condensate. Regular draining of condensate helps prevent corrosion. A connection for a drain valve is located in the lower part of the receiver. In vertical receivers, this is a G2" female threaded socket which, with the use of a G2" / G1/2" reducing plug, enables the installation of a drain pipe with a drain valve. To avoid having to open the drain valve manually, an automatic condensate drain can be installed. The following types are available:

  • Mechanical – operates on a float principle; when the condensate reaches the appropriate level, the valve opens automatically and drains the water.
  • Electronic, timer-controlled – best suited to large automated plants where the operating frequency of the compressor supplying the receiver can be determined with reasonable accuracy. However, if incorrectly set, it may cause the valve to open unnecessarily and discharge the medium instead of condensate.
  • Electronic with a level sensor: operates on a similar principle to the mechanical version, but the level sensor determines when the valve opens.

Additional connections may be provided on the receiver for installing accessories such as thermometers or, where the medium is water, level gauges.

Air dryers are often installed between the compressor and the receiver to reduce the moisture content of the incoming air. The lower the moisture content, the less condensate will form inside the receiver. This reduces the risk of corrosion and extends the receiver's service life.