CH971-57327 - Assy Pigtail OHS Ink Box 3L

Pigtail Ink Box 3 L – HP Scitex FB500 / FB550 / FB700 / FB750 / FB950 – CH971-57327

The Pigtail Ink Box CH971-57327 (HP part number: ASSY, PIGTAIL, OHS, PIRANHA, INKBOX) is the tube/filter/connector assembly that connects the 3-litre ink cartridge (ink box) to the ink supply system of HP Scitex FB series UV printers. It is the replacement part for the ‘pigtail’ fitted to the CMYK, Light Cyan and Light Magenta ink boxes.

On these machines, the ink is supplied in 3-litre containers housed in the supply bays. The pigtail connects the ink bag to the machine’s ink line, featuring an in-line filter that traps particles before they reach the pumps, carriage reservoirs and printheads. This filtration ensures a clean ink circuit and a stable ink supply to the printheads.

Supplied as a complete assembly (Assy) comprising tube, filter and connector; an original HP part, ready for fitting to the ink box. For white ink cartridges, HP specifies a dedicated pigtail: this part number covers the CMYK, Light Cyan and Light Magenta colours.

Technical specifications

• OEM part number: CH971-57327
• Manufacturer: HP
• HP designation: ASSY, PIGTAIL, OHS, PIRANHA, INKBOX
• Part type: Tube/filter/connector (pigtail) assembly for ink box
• Affected area: Ink supply system – 3-litre cartridges
• Inks concerned: CMYK, Light Cyan (LtC), Light Magenta (LtM)
• Delivery: Complete assembly, ready for fitting
• Part type: Genuine HP part (OEM)
• Application: HP Scitex FB large-format UV printers (flatbed / hybrid roll-to-rigid)

Compatibility and use

• HP Scitex FB500
• HP Scitex FB550
• HP Scitex FB700
• HP Scitex FB750
• HP Scitex FB950

Function

• Connect the 3-litre ink cartridge (ink box) to the machine’s ink circuit
• Filter the ink before it reaches the pumps, the carriage reservoirs and the print heads
• Ensure the connection between the ink bag and the ink line is airtight
• Maintain a continuous, air-bubble-free ink supply during printing

Possible symptoms of wear

• Ink leakage or seepage at the ink box connection
• Ink shortage or supply error even though the cartridge is not empty
• Clogged filter: reduced flow rate, repeated priming, missing nozzles for the affected colour
• Hardened, cracked or pinched tubing causing air to enter the ink line

Replacing the pigtail restores a leak-free connection and effective ink filtration, which is essential for protecting the machine’s pumps, reservoirs and print heads.

♻️ DG Spare Parts – European specialist in spare parts for large-format printers and plotters.