Honda - B-Series Thermostat Mounting Rubber Gasket Seal | Genuine Honda 19305-PLC-A00

Restore a leak-free cooling system with this genuine Honda Thermostat Mounting Rubber Gasket Seal. Honda part 19305-PLC-A00 is designed to seal the thermostat inside the thermostat housing, preventing coolant leaks while maintaining proper thermostat positioning and engine cooling performance. It is manufactured from high-quality OEM rubber for a precise fit and long service life. 

This seal replaces the earlier Honda part numbers 19305-PR3-000 and 19305-PT0-000. 

What It Does

The thermostat mounting rubber gasket:

• Creates a leak-proof seal around the thermostat
• Holds the thermostat securely in the housing
• Prevents coolant leaks
• Helps maintain proper cooling system pressure
• Supports consistent engine operating temperature

A damaged or flattened gasket may cause:

• Coolant leaking from the thermostat housing
• Coolant smell around the engine
• Loss of coolant
• Air entering the cooling system
• Overheating due to coolant loss
• Coolant residue around the thermostat housing

Features

• Genuine OEM Honda part
• Honda Part Number: 19305-PLC-A00
• OEM rubber construction
• Direct factory replacement
• Heat- and coolant-resistant material
• Ensures proper thermostat sealing
• Replaces:
• 19305-PR3-000
• 19305-PT0-000 

Package Includes

• One (1) Genuine Honda Thermostat Mounting Rubber Gasket Seal

This listing includes one individual rubber gasket only. Thermostat and thermostat housing are not included.

Commonly used on:

• Honda Civic (B-Series and many D/K-series applications)
• Acura Integra
• Integra GS-R
• Integra Type R
• Honda CR-V
• Honda Accord
• Honda del Sol
• 2013-2015 Acura ILX
• 1990-2002 Honda Accord
• 1997-2001 Honda CR-V
• 1991-2015 Honda Civic
• 1995-1998 Honda Odyssey

Honda uses this gasket across a wide range of engines from approximately 1990–2022, making it one of the most common OEM thermostat seals. Always verify fitment using your VIN or OEM part number before ordering. 

Installation Tips

• Clean the thermostat housing thoroughly before installation.
• Inspect the thermostat housing for corrosion or damage.
• Install the gasket evenly around the thermostat before reinstalling the housing.
• Replace the thermostat whenever servicing the cooling system if wear is suspected.
• Do not use RTV or sealant with this OEM rubber gasket unless specifically instructed by the factory service manual.

LOCATION: BIN B-43