Water / Coolant Pumps

Hex head bolt M6x25 with various applications
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Fits:
Porsche 986 Boxster - 1997 to 2004
Porsche 987 Boxster / Cayman - 2005 to 2012
Porsche 993 - 1994 to 1998
Porsche 997 - 2005 to 2012

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90037801301

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Hex head bolt M6x25 with various applications
Sold each

Fits:
Porsche 986 Boxster - 1997 to 2004
Porsche 987 Boxster / Cayman - 2005 to 2012
Porsche 993 - 1994 to 1998
Porsche 997 - 2005 to 2012

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90037801301

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Joining socket for water pump housing
This OE Match joining socket is a water pump housing connector used in the Porsche 911 cooling system. It is designed to connect the water pump housing and related coolant pipework, providing an OE-style fit and reliable sealing performance.
Sold individually, 

Fits:
Porsche 996 Turbo 2001 - 2005
Porsche 996 GT3 2000 - 2005
Porsche 997 Turbo / GT2 2007 - 2009
Porsche 997 GT2 RS 2011
Porsche 997 GT3 2007 - 2011

Diagram ref no 17

The joining socket forms a secure connection point within the coolant circuit, allowing coolant to pass correctly between the water pump housing and connected fittings or pipe sections. It helps maintain coolant flow, supports engine temperature control, and prevents coolant leaks around the water pump housing area.

Functions
•  Connects the water pump housing to coolant fittings or pipework
•  Helps maintain correct coolant flow through the engine cooling system
•  Provides a secure joining point between cooling system components
•  Helps prevent coolant leaks at the water pump housing connection
•  Supports reliable engine temperature regulation
•  Restores correct fitment when replacing or servicing coolant pipes
•  OE Match design for direct replacement and accurate installation

The water pump housing joining socket is exposed to constant heat cycles, coolant pressure, vibration, and age-related wear. Over time, the connector can corrode, crack, seize, or fail to seal correctly, leading to coolant leaks or poor cooling system reliability. Replacing it during water pump or coolant pipe service helps ensure a tight, secure connection and protects the engine from coolant loss or overheating.

When to Replace
•  Coolant is leaking around the water pump housing or pipe connection
•  The joining socket is cracked, corroded, damaged, or seized
•  The cooling system has been dismantled for water pump or pipework repairs
•  Coolant fittings or pipe bends are being replaced
•  The original connector no longer seals correctly
•  There are signs of coolant residue or staining near the connection
•  As preventative maintenance during major cooling system work

This connector fits into the engine's cooling system, near the water pump housing. It connects the cooling system hoses or fittings to the water pump housing and can be used at several points in the cooling system, depending on the engine model and design. Some refer to it as a water pipe joining socket, water pump housing connector, or coolant pipe adapter.

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99610623871

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O-ring seal for Joining socket for water pump housing, 28.00 x 4.50 mm
The Genuine Porsche 99970741140 O-ring seal is an OE replacement sealing ring for the joining socket on the water pump housing. It helps seal the coolant connection, maintain cooling system pressure and prevent leaks on selected Porsche 996 and 997 models. Ideal for use during water pump, thermostat, coolant flange or joining socket repairs.
Sold individually, 4 required per vehicle

Fits:
Porsche 996 Turbo 2001 - 2005
Porsche 996 GT3 2000 - 2005
Porsche 997 Turbo / GT2 2007 - 2009
Porsche 997 GT2 RS 2011
Porsche 997 GT3 2007 - 2011

Diagram ref no 18

This O-ring fits in the engine cooling system, at the joining socket / coolant inlet flange connection for the water pump housing. It is positioned in the rear engine area where the coolant pipework connects to the water pump housing assembly.

Functions:
•  Seals the joining socket connection at the water pump housing
•  Helps prevent coolant leaks from the water pump housing area
•  Maintains correct cooling system pressure
•  Supports reliable coolant flow through the engine cooling circuit
•  Helps protect surrounding engine components from coolant seepage
•  Provides an OE-quality replacement seal for Porsche cooling system repairs
•  Ensures correct fitment when refitting the joining socket, water pump housing or related coolant flange

O-ring seals can harden, flatten, crack or perish over time due to heat cycles, coolant exposure and engine vibration. Once the seal loses its elasticity, coolant can begin to seep or leak from the joining socket or water pump housing area. Replacing the O-ring with a Genuine Porsche OE seal helps restore the correct sealing performance and reduces the risk of coolant loss, pressure drop or overheating issues. It is also good practice to replace this seal whenever the joining socket or water pump housing is removed.

When to replace
•  When coolant is leaking from the water pump housing or joining socket area
•  During water pump, thermostat or coolant flange replacement
•  When the joining socket is removed or refitted
•  If the original O-ring is flattened, brittle, swollen or cracked
•  During engine cooling system repairs or restoration work
•  When carrying out preventative maintenance on older Porsche Turbo or GT3 models
•  If the cooling system is losing pressure or showing signs of seepage

Where it fits on the car
This O-ring fits in the engine cooling system at the water pump housing area. On the diagram, it is shown as item number 18, sealing the coolant pipe/joining socket connection. It works with the adjoining coolant pipe fittings and sealing components to keep the water pump housing connection leak-free.

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99970741140

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O-ring seal for Joining socket for water pump housing, 28.00 x 4.50 mm
This OE Match coolant pipe O-ring seal is a replacement sealing ring used at the water pump housing and coolant pipe connection on Porsche 996 and 997 models. It is designed to match the original seal dimensions and provide a secure, leak-resistant fit within the engine cooling system.
Sold individually, 4 required per vehicle

Fits:
Porsche 996 Turbo 2001 - 2005
Porsche 996 GT3 2000 - 2005
Porsche 997 Turbo / GT2 2007 - 2009
Porsche 997 GT2 RS 2011
Porsche 997 GT3 2007 - 2011

Diagram ref no 18

The O-ring creates a tight seal between the coolant pipe/joining socket and the water pump housing. It prevents coolant from escaping at the connection point and helps maintain the correct pressure and flow within the cooling system.

Functions:
• Seals the coolant pipe connection at the water pump housing
• Helps prevent coolant leaks from the joint
• Maintains cooling system pressure
• Supports correct coolant flow around the engine
• Helps protect the engine from coolant loss and overheating
• Provides an OE Match replacement for the original sealing ring
• Suitable for use during water pump, coolant pipe, or joining socket service

Coolant O-rings are exposed to heat, pressure, coolant additives, and repeated engine temperature cycles. Over time, the seal can harden, flatten, crack, swell, or lose elasticity, which may cause coolant leaks around the water pump housing. Replacing the O-ring helps restore a reliable seal and is recommended whenever the connected coolant pipe or joining socket is removed.

When to Replace
•   Coolant is leaking from the water pump housing connection
•   The O-ring is flattened, brittle, cracked, swollen, or damaged
•   The coolant pipe, joining socket, or water pump housing has been removed
•   There is visible coolant residue or staining around the joint
•   The cooling system is being repaired or pressure-tested
•   The original seal no longer seats correctly
•   As preventative maintenance during water pump or coolant pipe replacement

Where it fits on the car
This O-ring fits in the engine cooling system at the water pump housing area. On the diagram, it is shown as item number 18, sealing the coolant pipe/joining socket connection. It works with the adjoining coolant pipe fittings and sealing components to keep the water pump housing connection leak-free.

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99970741140

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Water Pump Bracket.

Fits:
Porsche 997 Turbo / GT2 MKI 3.6L M97.70 2006>>2009
Porsche 997 Turbo / GT2 RS MKII 3.6L M97.70 2010>>2011
Porsche 997 GT3 MKI 3.6L M97.76 2006>>2009

Diagram Ref No 32

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99611552173

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Water pump gasket.



Fits:
Porsche 987 Boxster / Boxster S 2005-08
Porsche 987C Cayman / Cayman S 2006-08
Porsche 997 Turbo / GT2 2007-11
Porsche 997 GT3 3.6L 2007-09

Click 'Zoom in' for large parts diagram.
Diagram ref no 2

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99710634000

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Water pump gasket.



Fits:
Porsche 987 Boxster / Boxster S 2005-08
Porsche 987C Cayman / Cayman S 2006-08
Porsche 997 Turbo / GT2 2007-11
Porsche 997 GT3 3.6L 2007-09

Click 'Zoom in' for large parts diagram.
Diagram ref no 2

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99710634000

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Water pump thermostat insert.

Fits:
Porsche 997 GT3 3.8L 2009 - 2011
Porsche 997 GT3 4.0L 2010 - 2011

Diagram Ref No 8

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9GT121113

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Water Pump Thermostat Insert.

The Wahler Water Pump Thermostat Insert is a Porsche 997 GT3 cooling system component designed to regulate coolant flow through the engine and radiator system. Installed within the thermostat or water pump housing, this insert opens and closes at specific temperatures to ensure the engine maintains its ideal operating range for efficiency, performance, and reliability.

Fits:

• Porsche 997 MK1 GT3 2007-09
• Porsche 997 MKII GT3 2010-11 

Diagram Ref No 8 

What This Product Does:

• Regulates coolant circulation through the engine cooling system
• Maintains optimal engine operating temperature
• Controls engine warm-up and cooling efficiency
• Works with the water pump and radiator to stabilise temperatures
• Helps prevent overheating and overcooling
• Supports fuel efficiency, emissions control, and engine performance

Symptoms Of Wear Or Failure:

• Engine overheating Engine running too cool or slow to reach operating temperature
• Fluctuating temperature gauge readings
• Poor cabin heater performance
• Coolant leaks around the thermostat housing
• Reduced fuel efficiency caused by incorrect engine temperature
• Check engine light related to cooling system faults  

Why Replacement Matters:

• Restores proper coolant flow and temperature regulation
• Prevents overheating and potential engine damage
• Improves engine efficiency and fuel economy
• Ensures reliable heating and climate control performance
• Protects cooling system components from excessive stress and wear
• Maintains long-term engine reliability and performance

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9GT121113

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Water pump. Porsche 997 Turbo / GT2 / GT3


Fits
Porsche 997 Turbo / GT2 2007-09
Porsche 997 GT3 / GT3 RS / GT3 4.0 2007-12
Porsche 997.2 Turbo 2010-11 (3.6L M97.70 engines)

NOTE: Water Pumps DO NOT COME WITH MOUNTING GASKETS.

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99710601172

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Water pump. For cars with 3.6L engines
Replacement water pump with gasket. Rotor / Impeller: 67mm.



Fits
Porsche 997.1 Turbo / GT2 2007-09
Porsche 997 GT3 / GT3 RS / GT3 4.0 2007-12
Porsche 997.2 Turbo 2010-11 (3.6L M97.70 engines)

NOTE: Water Pump COMES WITH MOUNTING GASKET.

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99710601172

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Replacement water pump with gasket.



Fits
Porsche 997 Turbo / GT2 2007-09
Porsche 997 GT3 / GT3 RS / GT3 4.0 2007-12
Porsche 997.2 Turbo 2010-11 (3.6L M97.70 engines)


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99710601172

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