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Premium Thermostat Solutions

Professional manufacturer of wax thermostats for construction machinery, trucks, cars, and diesel engines. OEM parts, high quality, stable pricing, and global delivery.

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About Us

Ruian Thomson Auto Parts Co., Ltd – A trusted name in automotive thermostat manufacturing.

Ruian Thomson Auto Parts Co., Ltd

We are a professional manufacturer of wax thermostats, specializing in high-quality components for excavators, engineering vehicles, heavy trucks, cars, and agricultural vehicles. With years of experience in auto parts production, we serve foreign trade enterprises and are a strategic partner to many well-known global brands.

Our commitment to excellence is reflected in our advanced production equipment, stable pricing, and excellent product quality. 'Good reputation, stable price, excellent quality' is our core business policy.

20+
Years in Business
200+
Thermostat Items in Stock
10+
Global Sales Network
Factory Production Line

Our Products

High-performance thermostats for every application

Original Perkins Diesel Engine Thermostat 4133L066

Original Perkins Thermostat 4133L066

OEM diesel engine part for optimal temperature control.

  • • Wax thermostat type
  • • For Perkins diesel engines
  • • Factory direct pricing
  • • Global shipping available
OEM 4133L509 Coolant Thermostat

OEM 4133L509 Coolant Thermostat

High-efficiency engine coolant thermostat for Perkins models.

  • • Factory price guarantee
  • • Precision temperature control
  • • Durable wax element
  • • Compatible with multiple models
Engine Coolant Thermostat 1118010

Engine Thermostat 1118010

OEM replacement with reliable performance.

  • • OEM No. 1118010
  • • For heavy-duty applications
  • • Stable opening temperature
  • • Corrosion-resistant housing
Car Engine Thermostat 90916-03117

Car Thermostat 90916-03117

Precision coolant control for automotive engines.

  • • Direct OEM replacement
  • • Fast response time
  • • Long service life
  • • Leak-proof design
Thermostat Assembly

Thermostat Assembly

Complete kits for easy installation and maintenance.

  • • Includes gasket and hardware
  • • Pre-tested for reliability
  • • Wide vehicle compatibility
  • • Factory-sealed packaging
Construction Machinery Thermostat

Construction Machinery Thermostat

Built for excavators, loaders, and heavy equipment.

  • • High-temperature tolerance
  • • Vibration-resistant design
  • • OEM specifications met
  • • Long-term durability
Truck Thermostat

Truck Thermostat

Reliable thermal regulation for commercial fleets.

  • • For heavy-duty diesel engines
  • • Consistent performance
  • • Reduced engine wear
  • • Quick delivery from stock
Thermostat Housing

Thermostat Housing

Durable housing units for precise thermostat fit.

  • • CNC-machined aluminum
  • • Leak-proof sealing
  • • Corrosion-resistant finish
  • • OEM dimension accuracy

Why Choose Tomusen?

Engineered for performance, reliability, and global standards.

OEM Quality

All products meet or exceed original equipment manufacturer specifications.

Fast Delivery

In-stock items ship within 5 days. Custom orders in 5–12 days depending on volume.

Global Reach

Serving customers in Europe, Americas, Middle East, Asia, and Africa.

Certified Manufacturer

We are a verified manufacturer with ISO-level production standards.

20+
Years Experience
200+
Product SKUs
10+
Countries Served
100%
Customer Satisfaction

Latest News

Industry insights, events, and innovations.

Shanghai Automechanika 2025
Nov 21, 2025

2025 Shanghai Automechanika

Join us at the world's leading automotive trade fair. Visit our booth to see the latest thermostat innovations.

Intelligent Thermostat Technology
Feb 20, 2024

Intelligent Thermostat: Driving Safety & Efficiency

Discover how smart wax thermostats improve fuel economy and engine longevity.

Automechanika Shanghai
Nov 25, 2023

Automechanika Shanghai

Our booth No. 4.1H115. Date: Nov 29 – Dec 2. Welcome to visit us!

Frequently Asked Questions

Are you a trading company or a manufacturer?

We are a manufacturer. Ruian Thomson Auto Parts Co., Ltd is a professional manufacturer of wax thermostats.

How long is your delivery time?

Under normal circumstances, if the goods are in stock, delivery takes 5 days. If not in stock, it takes 5–12 days depending on the order quantity.

When can I get the price?

We will reply within 24 hours after receiving your inquiry. For urgent requests, you may contact us directly via phone or WhatsApp.

Get in Touch

Reach out to us for quotes, technical support, or partnership opportunities.

Contact Information

Email: [email protected]

Email: [email protected]

Mobile: +86 183 7267 5090

Mobile: +86 135 0577 0556

Tel: +86 577 6536 9082

Fax: +86 577 6537 5995

WeChat: millaparts

WhatsApp: +8618372675090

WhatsApp: +8618772815090

Address: No.107, Tianfeng Street, Zhaozhai Industrial Zone, Tangxia, Rui'an, Zhejiang, China

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