We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Malleable iron reducer coupling, 3 inch by 2-1/2 inch FNPT, dark grey finish

Value Brand

Value Brand 3 in x 2-1/2 in Reducer Coupling

SKU CH-KZS8-7SC3H

Connects 3 inch and 2-1/2 inch pipes with Class 150 malleable iron NPT threads

  • Malleable iron construction resists cracking under pressure
  • Class 150 rating handles standard plumbing demands
  • Female NPT threads on both ends simplify pipe connections
  • Reduces 3 inch line to 2-1/2 inch size
  • Zoro Select brand ensures consistent manufacturing quality

What this fitting is and who needs it

This reducing coupling joins a three-inch female NPT pipe to a two-and-a-half-inch female NPT pipe. It is made from malleable iron rated for Class 150 service. Plumbers and maintenance crews use it when a straight reduction is required in water, air or oil lines. Buyers who need a different thread type or a larger step-down will need another fitting.

Thermals noise and power draw in normal use

Malleable iron handles the temperatures and pressures found in standard Class 150 piping systems without deformation. The coupling has no moving parts, so it adds no vibration or noise to the line. It requires no external power and draws no current. Installers should confirm the system pressure stays within the class rating.

The specification that decides fit

The coupling provides a three-inch female NPT connection on one end and a two-and-a-half-inch female NPT connection on the other. Both ends use the same NPT thread standard. This single size combination determines whether the part matches the existing pipework.

Highlights

  • Malleable iron construction resists cracking under pressure
  • Class 150 rating handles standard plumbing demands
  • Female NPT threads on both ends simplify pipe connections
  • Reduces 3 inch line to 2-1/2 inch size
  • Zoro Select brand ensures consistent manufacturing quality

Specifications

BrandZORO SELECT

Questions about this item

How do I install the 3 inch NPT threads without cross-threading the malleable iron?

Clean both male threads, apply PTFE tape clockwise or pipe dope, start the coupling by hand until snug, then tighten with a pipe wrench no more than two extra turns to avoid cracking the Class 150 fitting.

Will the malleable iron coupling need replacement due to corrosion or thread wear?

In potable water systems inspect annually for rust or mineral build-up; replace if threads show galling or the body develops leaks, otherwise the iron lasts decades.

What pressure limit appears first during continuous service on this Class 150 reducer?

The Class 150 rating caps continuous working pressure at 150 psi; sustained pressure above that will stress the malleable iron before any thread seal fails.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.