- This part is in stock in our warehouse and will ship out within 1 business day of the order being placed.
- New stock is on the way! On order parts usually ship within 7 business days.
- Item is not in stock and usually ships 10-15 business days from the time you place your order.
- This item is no longer being made by the manufacturer, and cannot be added to your shopping cart.
Product Description
?This cold start valve, also referred to as an unloader valve, is supplied by the original manufacturer for use in electric air compressors. It has a length of 0.63 inches, a 1/8-inch male pipe thread, and a hexagonal head for increased stability and security. It allows the compressor to easily start in cold conditions by releasing air pressure from the compressor head or the discharge line which reduces the amount of power needed for the motor to start. Once the compressor starts and the pressure in the tank increases, the valve closes and allows pressure to build. If the valve is faulty, the compressor motor will struggle to start, overheat, or trip the circuit breaker. Disconnect the compressor from the power source and open the drain valve to depressurize the tank. Disconnect the pressure switch line from the valve and unscrew the valve using a wrench. Thread the new valve into place and be careful not to overtighten it. Reattach the pressure switch line and close the drain valve to complete the repair.
Frequently Purchased Together
?Troubleshooting
- DeWALT
- Porter Cable
- Compressor
Customer Part Reviews
?- < Prev
- 1
- Next >

Questions & Answers
?Our customer Service team is at the ready daily to answer your part and product questions.
We're sorry, but our Q&A experts are temporarily unavailable.
Please check back later if you still haven't found the answer you need.
Ask our Team
We have a dedicated staff with decades of collective experience in helping customers just like you purchase parts to repair their products.
Customer Repair Instructions
All our customer repair instructions are solicited directly from other customers just like you who have purchased and replaced this exact part.
- < Prev
- 1
- Next >
Compressor wouldn\'t build pressure
Richard from Worley, Idaho
- Difficulty Level:
- Easy
- Total Repair Time:
- Less than 15 mins
- Tools:
- Wrench set
- Parts Used:
- 5130033-00
Gauge broke cold start leaking air filter bad
LAMAR from LIVERPOOL, Pennsylvania
- Difficulty Level:
- Easy
- Total Repair Time:
- Less than 15 mins
- Tools:
- Wrench set
- Parts Used:
- 5140206-58, 5130205-00, 5130033-00
Air Compressor would not build up pressure.
Christopher from Bossier City, Louisiana
- Difficulty Level:
- Easy
- Total Repair Time:
- Less than 15 mins
- Tools:
- Wrench set
- Parts Used:
- 5130033-00
It would leak out at starting
Michael from Cookson, Oklahoma
- Difficulty Level:
- Easy
- Total Repair Time:
- Less than 15 mins
- Tools:
- Wrench set
- Parts Used:
- 5130033-00
Cracks causing leaks.
Bryan from Purlear, North Carolina
- Difficulty Level:
- Easy
- Total Repair Time:
- 30 - 60 mins
- Tools:
- Pliers, Screw drivers, Wrench (Adjustable), Wrench set
- Parts Used:
- 5140038-47, 5140030-78, 5130033-00
Bad valve.
Ross from Pacifica, California
- Difficulty Level:
- Easy
- Total Repair Time:
- 15 - 30 mins
- Tools:
- Pliers, Screw drivers, Wrench set
- Parts Used:
- 5130033-00
Air leak.
Robert from Twentynine Palms, California
- Difficulty Level:
- Easy
- Total Repair Time:
- Less than 15 mins
- Tools:
- Wrench (Adjustable)
- Parts Used:
- 5130033-00
- < Prev
- 1
- Next >
Some of the parts we sell are eligible for mail-in rebates since we can recycle them. We will display any applicable rebates in your shopping cart. To redeem your rebate, contact Customer Service after you have received your part.