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A brass close nipple is a short, threaded pipe fitting used to connect two female threads in close proximity. Here are the typical sizes available:

Standard Sizes for Brass Close Nipple

Close nipples are usually specified by:

Nominal Pipe Size (NPS) – The diameter designation

Thread Type – Typically NPT (National Pipe Taper) or BSP (British Standard Pipe)

Common Sizes (NPT Threads)

Size (inches) Threads Per Inch (TPI) Approx. Length (inches)

1/8" 27 ~0.5"

1/4" 18 ~0.6"

3/8" 18 ~0.7"

1/2" 14 ~0.8"

3/4" 14 ~1.0"

1" 11.5 ~1.2"

Other Variations

BSP (British Standard Pipe) Threads – May have different TPI (e.g., 1/2" BSP is 14 TPI but with a different thread angle).

Hex Close Nipple – Some have a hexagonal middle for easier tightening.

Different Materials – While brass is common, stainless steel, galvanized, or black iron versions also exist.

A brass union with nut and sleeve is a type of piping fitting used to connect two pipes securely while allowing for easy disassembly when needed. It consists of three main components:

Brass Union Body – The central part that joins the two pipe ends.

Brass Nut – A threaded fastener that tightens over the union to hold it together.

Brass Sleeve (or Ferrule) – A cylindrical component that helps create a tight seal when compressed by the nut.

Key Features:

Material: Made of brass, which offers good corrosion resistance and durability.

Sealing Mechanism: The nut compresses the sleeve against the pipe, forming a leak-proof connection.

Reusable: Can be disassembled and reassembled multiple times without losing integrity.

Applications: Commonly used in plumbing, gas lines, hydraulic systems, and compressed air systems.

Installation Steps:

Slide the nut onto one pipe, followed by the sleeve.

Insert the pipe into the union body.

Slide the sleeve into position and tighten the nut to compress the sleeve, creating a seal.

This type of fitting is preferred for its reliability and ease of maintenance in fluid and gas systems.

A brass reducing coupling is a type of pipe fitting used to connect two pipes of different diameters in a plumbing or hydraulic system. It ensures a secure, leak-proof connection while transitioning between pipe sizes.

Key Features of Brass Reducing Coupling:

✔ Material: Made from high-quality brass (often DZR - Dezincification Resistant) for corrosion resistance and durability.

✔ Thread Type: Typically features male (MPT) or female (NPT/BSP) threads for a tight seal.

✔ Pressure & Temperature Rating: Suitable for moderate to high-pressure applications (varies by size and design).

✔ Applications: Used in water supply, gas lines, HVAC, and industrial piping systems.

Common Sizes Available:

Brass reducing couplings come in various combinations, such as:

1/2" x 3/8"

3/4" x 1/2"

1" x 3/4"

1-1/4" x 1"

Other custom sizes available

Types of Brass Reducing Couplings:

Hex Head Reducing Coupling – Has a hexagonal middle for easy wrench tightening.

Straight Reducing Coupling – Smooth body, used where space is limited.

Female x Female (FxF) or Male x Female (MxF) – Different thread configurations.

Installation Tips:

Use Teflon tape or pipe thread sealant for a leak-proof seal.

Tighten with a wrench, but avoid over-tightening to prevent damage.