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Black steel pipe nipple with threaded NPT ends

Zoro Select

Zoro Select 40506 Pipe Nipple Steel 3/4" NPTxNPT 4

SKU CH-5R2D-13E0W

Steel pipe nipple with 3/4 inch NPT threads on both ends, rated for 2555 psi at 650 degrees F

  • Product colorTransparent
  • Handles 2555 psi for demanding fluid lines
  • Rated to 650 °F for high-temperature steam service
  • Grade B steel resists corrosion in harsh environments
  • 3/4 in NPT threads connect without adapters
  • Suitable for air, gas, oil and non-potable water

Zoro Select 40506 Steel Pipe Nipple

The Zoro Select 40506 is a 3/4 inch NPT steel pipe nipple built for air, natural gas, non-potable water, oil and steam lines. It suits plumbers and maintenance crews who need a threaded connector rated for high-pressure service. The welded Grade B steel construction carries a black finish and meets Class 300 fitting compatibility. It is supplied new and globally sourced.

Replaces worn or leaking threaded nipples

This nipple replaces a damaged or corroded section of 3/4 inch NPT piping without changing the nominal size. The jump is worth it when the existing fitting cannot hold 2555 psi at 650 degrees F or when steam service at that pressure and temperature is required. It also fits systems that must operate down to -20 degrees F. The 4 inch length bridges the gap where a shorter nipple falls short.

Suits high-pressure steam, gas and oil lines

The fitting suits installers who need a steel nipple rated for 2555 psi steam and 600 degrees F maximum temperature. It is not for potable water systems. Buyers who need a larger nominal diameter, a different thread type or a lower pressure class should look at other fittings. The California Proposition 65 warning applies to this product.

How it compares

Measured against everything we stock in Drain Stoppers, Strainers & Traps, at today’s prices. Recalculated every night.

Price $2.99
Cheaper than about 96% of the 4,240 comparable items (median $31.99).

Specifications

Product
Brand nameZORO SELECT
Product colorTransparent

Questions about this item

What thread size and length does the 3/4-inch NPT nipple need to fit?

The nipple has 3/4-inch NPT threads on both ends and an overall length of 4 inches, so it fits any Class 300 female NPT port with that spacing.

How do I install the steel nipple without causing leaks?

Apply PTFE tape or pipe dope to the male NPT threads, hand-tighten, then use a wrench on the hex flats for one to two extra turns; over-tightening cracks the fitting.

When should I replace the nipple in a steam line?

Replace it if you see external corrosion, thread deformation, or if the system exceeds 2555 psi at 650 °F, the rated steam limit for the Grade B steel.

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