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Quality — Made in Germany

81 11 250
Siphon and Connector Pliers

  • Ideal for tightening and loosening siphon screw connections, plastic pipe fittings and round union nuts
  • Fine adjustment for ideal adjustment to diverse diameters
  • For connectors, oil filters, plastic pipes and siphons
  • Robust, heavy duty
  • For connectors and couplings with screw connection, such as Cannon circular connectors
  • For gentle loosening of hoses on nozzles and filter cartridges
  • Optimum adhesion on dirt-, oil- and fatfree surfaces
  • 25-way adjustable box joint
  • Ergonomic handle geometry
  • Changeable gripping jaws with two-component plastic insert with a hard carrier component (red) and a soft adhesive component (blue)
  • With exchangeable plastic jaws for sensitive surfaces; up to Ø 75 mm
Technical attributes
Article No.
81 11 250
black atramentized
with non-slip plastic coating
345 g
250 x 63 x 18 mm
DIN ISO 8976
REACH compliant
does not contain SVHC
RoHS compliant
not applicable
Adjustment positions

Large clamping range – several possible applications

For odour trap screw joints, connectors and hoses that have become stuck

The siphon and connector pliers from Knipex are suitable for a range of applications requiring large grip widths and gentle changes of grip that will not damage components. When odour traps need to be opened on kitchen and bathroom fittings, they can be gripped and twisted powerfully in a measured way using the siphon and connector pliers from Knipex. The pliers can unscrew and tighten screw joints on plastic pipes and sensitive connectors, and are also suitable for detaching hoses that have become stuck to supports – e.g. coolant hoses.

Surface contour adapted to the pipe protects screw joints

The gripping jaws here have a different shape to those of water pump pliers, for example. With the siphon and connector pliers, the shape of the gripping jaws has been designed for large pipe diameters. As a result of their round shape, the siphon and connector pliers are used with union nuts on connectors in addition to screw joints of pipes conveying liquids and gas. Such connectors establish an electrical connection that is weather and vibration resistant, e.g. between coaches of rail vehicles. The firmly screwed, replaceable plastic jaws of the Knipex 81 13 250 offer particularly good protection for sensitive surfaces.

Versatile and tough: 25 possible settings and box joint design

With the 25 possible settings, which can be conveniently set to the desired grip width using the fine adjustment push button, the Knipex siphon and connector pliers have a large gripping range of Ø 10 - 75 mm. Thanks to the box joint design and manufacture from oil-hardened chrome vanadium electric steel, the pliers are very tough. The high quality chrome-plating provides good corrosion resistance.

Brief overview

Powerful tightening and loosening of odour traps, plastic pipes and connectors without damaging surfaces

Grip components Ø 10 - 75 mm

25 possible settings

Fine adjustment at the press of a button

Handles coated with non-slip plastic

Pliers are black, phosphate-treated; with fixed, replaceable plastic jaws for sensitive surfaces

Length 250 mm

Net weight 355 g

Plastic jaws for chrome parts

Using the plastic jaws, sensitive chrome parts can be gripped and turned without damaging them.

For odour trap screw joints

The width and shape of the jaw have been designed for tightening and loosening odour trap screw joints.

Gentle twisting

Mountings with smaller diameters can also be twisted gently thanks to the plastic jaws.

Replaceable plastic jaws

The plastic jaws can be replaced easily if worn out.

All variations

81 01 250
Siphon and Connector Pliers
181-250 mm
atramentised / lacquered / burnished
plastic coated
Ø 25 – 80 mm
Length: 250 mm
81 03 250
Siphon and Connector Pliers
181-250 mm
chrome-plated / zinc-plated
plastic coated
Ø 25 – 80 mm
Length: 250 mm
81 13 250
Siphon and Connector Pliers
181-250 mm
chrome-plated / zinc-plated
plastic coated
Ø 10 – 75 mm
Length: 250 mm
Technical changes and errors reserved.