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Hexagonal malleable iron pipe reducer, dark grey finish

Value Brand

Value Brand 5P559 Reducer 3/8" x 1/4" FNPT Malleable Iron

SKU CH-3B1J-J52YG

A malleable iron pipe reducer connecting 3/8 inch and 1/4 inch female NPT threads at Class 150 pressure rating

  • Malleable iron construction resists cracking under pressure
  • Class 150 rating suits standard plumbing demands
  • 3/8" to 1/4" FNPT connects different pipe sizes
  • Straight thread design simplifies installation alignment
  • New condition ensures clean, undamaged threads

3/8" x 1/4" FNPT Reducer

The ZORO SELECT 5P559 reducer connects a 3/8 inch female NPT port to a 1/4 inch female NPT port. It is made from Class 150 malleable iron for general plumbing and compressed-air lines. The straight-threaded body suits installers who need a durable step-down fitting in a compact form.

Upgrading from bushings or improvised adapters

A single-piece reducer replaces stacked bushings that can leak or vibrate loose over time. The jump is worth it when a clean, permanent transition between two pipe sizes is required and the system pressure stays within the Class 150 rating.

Installation notes

Thread sealant or tape on the 18-thread male ends ensures a tight seal without over-tightening the iron. The most common issue is cross-threading the smaller 1/4 inch port when the fitting is forced into a confined space.

Highlights

  • Malleable iron construction resists cracking under pressure
  • Class 150 rating suits standard plumbing demands
  • 3/8" to 1/4" FNPT connects different pipe sizes
  • Straight thread design simplifies installation alignment
  • New condition ensures clean, undamaged threads

Specifications

BrandZORO SELECT

Questions about this item

Will this reducer fit a 3/8 in Female NPT port and a 1/4 in Female NPT port?

Yes, it connects a 3/8 in Female NPT thread to a 1/4 in Female NPT thread, both straight and threaded.

Do I need thread sealant when installing this malleable iron reducer?

Apply pipe thread sealant or tape to the male threads before tightening into the Female NPT ends to prevent leaks.

How often should I inspect this Class 150 malleable iron fitting for corrosion?

Inspect periodically for rust or scale buildup, especially in water systems, and replace if threads show damage or sealing surfaces degrade.

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