Prichal (Russian: Причал, lit. 'pier'), also known as the Uzlovoy Module (UM, Russian: узловой модуль, romanized: Uzlovoy Modul, lit. 'Node Module') is a Russian-built component of the International Space Station (ISS). This spherical module has six docking ports (forward, aft, port, starboard, zenith, and nadir) to provide additional docking ports for Soyuz and Progress spacecraft, as well as potential future modules.

Prichal was launched on 24 November 2021, at 13:06:35 UTC, atop a Soyuz-2.1b rocket and guided automously into the nadir port of the Nauka module by a Progress M-UM spacecraft modified into a space tug and attached to the Prichal's nadir port. Once in place, the Progress spacecraft disconnected for a destructive reentry. As of 2024, the forward, aft, port and starboard docking ports remain covered.

Prichal was initially intended to be an element of the now canceled Orbital Piloted Assembly and Experiment Complex (OPSEK). As of December 2025^[update], plans for the future Russian Orbital Station (ROS) state that Prichal will be deorbited and replaced by a new Universal Node module in 2028.

Prichal is a nodal module that has a pressurized spherical ball-shaped design with six hybrid docking ports. It also has functional components located outside and inside it. The interior of the module is divided into two zones: habitable and instrument with on-board systems. The zenith port out of the six ports is active SSVP-M to allow docking with the space station, while the four ports are passive hybrids of SSVP-M called SSPA-GB 1/2, enabling other modules to dock with the module. Lastly, the nadir port is a passive SSVP-M; but has SSPA-GM adapter fitted on it converting it into SSVP-G. This would support the automated transfer of propellants between docked Russian spacecraft and the space station in both directions and the automated docking of crewed and uncrewed spacecraft using the KURS-NA system along with docking of future modules like Prichal to Nauka after removal of the adapter. Such a design is significantly different from that of the docking modules Pirs and Poisk that have only one docking port for spacecraft each. The docking compartment has an internal volume of 19 m³ (670 cu ft). It also has ERA grapple fixtures for the European Robotic Arm to move about from one part of the module to other parts or to Nauka.

During development, Prichal module was called the Uzlovoy Module (UM, Russian: узловой модуль, romanized: Uzlovoy Modul', lit. 'Node Module').

The Orbital Piloted Assembly and Experiment Complex (OPSEK) was a proposed Russian space station intended to support deep space human exploration missions to Mars, possibly the Moon, and Saturn. It was planned to be partially constructed in orbit while attached to the ISS. Prichal, with its six docking ports, would have served as the only permanent element of OPSEK, while other modules would come and go as their life span and mission required. In September 2017, Roscosmos stated that there were "no plans to separate the Russian segment from the ISS". This ended public OPSEK plans.

In the mid-2000s, RKK Energia, the manufacturer of the Russian Orbital Segment (ROS) components, added the Uzlovoy Module (UM) to the future configuration of the ISS. The proposal involves the addition of a Nodal Module (a significant modification of the Universal Docking Module (UDM) design, increasing the number of docking ports from 4 to 6 and taking into account its location at the Nauka nadir and at the same time reducing its weight from 20 tons to 4 tons, partly by removing the additional life-support system ) and adding two additional science/energy modules to the segment around 2013–2015. These plans were tabled due to Nauka delays. Since the refurbishment of the Nauka module, the Uzlovoy module is now the Prichal module. Despite its small size, this four-ton, ball-shaped module could play an extremely important role in the Russian space program.^{[needs update]}

The preliminary design was completed on 15 January 2011, when RKK Energia announced that its Scientific and Technical Council (NTS) conducted a meeting that reviewed and approved the preliminary design of the Nodal Module and associated hardware. The meeting also approved the specialized launch craft, a Progress cargo ship designated the Progress M-UM and the adaptation of the Soyuz launch vehicle for the launch of the Progress M-UM spacecraft module.