501570 STZ Pipe Union

Review STZ 3/8 Inch Black Pipe Union

The STZ 501570 3/8 inch pipe union is a high-quality plumbing component designed for reliable and long-lasting connections in various piping systems. This union, manufactured by STZ, is engineered to ensure a secure and leak-free joint between two lengths of 3/8 inch pipe.

The union is constructed from carbon steel, ensuring durability and resistance to corrosion. It features a heavy-duty forged body that provides added strength and stability to the joint connection. The union's threads are made to meet or exceed ANSI standards, ensuring compatibility with a wide range of piping systems.

The STZ 501570 union comes with a sealing nut, a gasket, and a lock nut, all included in the package. The gasket is made from high-quality, resilient material that provides an effective seal between the pipes, preventing leaks and ensuring the integrity of the piping system. The lock nut is designed to securely lock the union in place, preventing any unwanted movement or loosening of the connection.

The union also features a hexagonal socket on the lock nut, allowing for easy and convenient tightening and loosening of the connection using a standard wrench. Additionally, it has a raised face design on the sealing nut that provides extra sealing surface, ensuring a tight and secure joint connection.

The STZ 501570 3/8 inch pipe union is suitable for use in a variety of applications, including water supply, natural gas, and industrial piping systems. Its robust construction and reliable sealing capability make it an ideal choice for applications where leak-free connections are essential. With its high-quality components and proven design, this union is sure to provide reliable performance and long service life.

STZ 501570 3/8 pipe union is a type of piping component used to connect and join pipes. Here are some pros and cons of buying this particular pipe union:

1. Leak-free connection: STZ 501570 3/8 pipe union is designed to provide a leak-free connection between two pipes. It uses a threaded connection with an O-ring seal that ensures a tight and secure fit.

2. Durable: This pipe union is made of brass material, which is known for its durability and resistance to corrosion. Brass is also a good conductor of heat, making it suitable for use in heating systems.

3. Easy to install: The pipe union comes with a pre-applied thread sealant, which eliminates the need for additional sealing materials. It is also easy to disassemble for maintenance or repair.

4. Versatile: STZ 501570 3/8 pipe union can be used in various applications, including water, gas, steam, and hydraulic systems.

1. Cost: Brass pipe unions, like STZ 501570, can be more expensive than other materials such as plastic or stainless steel.

2. Thread damage: Over-tightening or under-tightening the threads during installation can lead to damage and potential leaks. Proper torque specifications must be followed to ensure a successful installation.

3. Limited temperature range: Brass pipe unions are not recommended for use in high-temperature applications, as the material can degrade over time and potentially fail.

STZ 501570 3/8 pipe union is a reliable and durable piping component that offers a leak-free connection and is suitable for various applications. However, it comes with some drawbacks, such as a higher cost and limited temperature range. If the application requirements align with the benefits of using a brass pipe union, it can be a good investment. Otherwise, other materials like plastic or stainless steel may be more suitable and cost-effective.

Consider the specific requirements of your application, such as temperature range, material compatibility, and cost, when deciding whether to purchase STZ 501570 3/8 pipe union or another type of piping component. If the benefits of using a brass pipe union outweigh the drawbacks for your application, then it can be a recommended option. Otherwise, explore other materials and pipe union designs that may better fit your needs and budget.

Details:

Not for use with potable drinking water. 3/8, black union, brass/iron. Pressure tested directly at the factory. Black pipe union - 501570: when selecting gas pipe for your home Stz and fittings are the way to go.

Our durable black iron fittings are pressure tested at the factory. Rated at maximum 300 psi 150 f or. Ul and FM listed.

Can also be used for DI pipe projects, preparation materials not included. Fittings, nipples, and pipe come in an array of sizes to meet your homes gas, air, LP needs. Use for above ground gas, LP and air applications.

specifications pipehosefit:

• brand: Stz
• mpn: 501570
• part type: Pipe

returns pipehosefit:

• time: 30 days
• policy: returns accepted
• paid by: buyer

offer pipehosefit:

• availability: in stock
• started: august 27, 2025
• prices: $13.04–$36.99
• item condition: New
• options: ship-to-home
• sold #: 14

shipping pipehosefit:

• type: fixed
• transit: 28-42 days
• service: economy int'l postage
• class: economy

seller pipehosefit:

• rating: 98.3%
• city: mountain top, pa
• # reviews: 13147

payments pipehosefit:

• credit card: visa
• wallet: apple-pay

general pipehosefit:

• category: Business & Industrial > Adapters > Pipe Hose > Threaded Fittings