B&K Schedule 40 1/2 in. MIP X 1/2 in. D MIP Polyethylene 4 in. Nipple

Meet the B&K Schedule 40 1/2 in. MIP X 1/2 in. MIP Polyethylene 4 in. Nipple—a compact, reliable connector designed to join 1/2" pipe threaded fittings with ease. This 4-inch nipple uses two 1/2" MIP (Male Iron Pipe) ends, giving you a straightforward, corrosion-resistant link in polyethylene that stands up to everyday water service and irrigation applications.

key specifications

• Length: 4 inches
• Material: Polyethylene
• End 1: 1/2" MIP
• End 2: 1/2" MIP
• End 3: none
• Schedule: Schedule 40
• Maximum pressure: 425 psi
• Maximum temperature: 140°F
• Brand: B&K
• Product type: Nipple
• End type: MIP on both ends
• Packaging: 1 piece per package

why this nipple stands out

Polyethylene construction delivers robust corrosion resistance and chemical compatibility that metal alternatives can’t match, making it an excellent choice for water service and irrigation lines. The Schedule 40 wall thickness balances a strong internal bore with practical handling, reducing weight without sacrificing integrity. The two 1/2" MIP ends simplify installations where standard pipe fittings with male threads are involved, letting you connect sections quickly and confidently.

practical use cases

• Connecting two 1/2" MIP threaded fittings in residential or commercial water lines.
• Extending a 1/2" polyethylene run in irrigation systems where a lightweight, durable connector is needed.
• Repairs or interim extensions in plumbing layouts that favor corrosion resistance and ease of handling.
• Temporary or permanent piping projects where maintaining a clean bore and predictable thread engagement matters.

installation tips

• Clean threads on both fittings before assembly to ensure a tight seal.
• Use a thread sealant or PTFE tape rated for plastic threads; apply sparingly to avoid material squeeze-out into the bore.
• Hand-tighten the nipple, then snug with a wrench—avoid overtightening which can crack or distort threads.
• Verify compatibility with your 1/2" MIP fittings and ensure the operating pressure and temperature limits (up to 425 psi and 140°F) won’t be exceeded in your system.

compatibility and care

This 1/2" MIP x 1/2" MIP polyethylene nipple is designed to pair with standard 1/2" MIP threaded fittings and pipes in polyethylene systems. For long-term reliability, store in a cool, dry place and inspect the nipple before installation to confirm there are no cracks or deformations. When used as part of a well-mined polyethylene network, it helps maintain smooth flow, minimizes corrosion-related issues, and supports straightforward maintenance or future expansion.