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
Galvanised malleable iron reducing coupling 1 inch to 3/4 inch NPT

Value Brand

Value Brand Reducing Coupling Malleable Iron Galvanized Class 150 1 in NPT 3/4 in NPT

SKU CH-940E-HCW08

Galvanised malleable iron reducing coupling connects 1 in NPT to 3/4 in NPT, rated Class 150 for plumbing systems

  • Reduces pipe size from 1 in to 3/4 in NPT
  • Malleable iron construction provides mechanical strength
  • Galvanized coating resists corrosion in wet systems
  • Rated for Class 150 pressure service
  • Female NPT threads on both ends for standard connections

Reducing Coupling Malleable Iron Galvanized

This reducing coupling connects a 1 inch NPT female thread to a 3/4 inch NPT female thread. It is made from malleable iron with a galvanized finish and rated for Class 150 service. The fitting suits plumbing systems that require a transition between these two pipe sizes.

Thread Size Transition For Existing Pipework

It replaces a straight coupling when the pipeline must step down from 1 inch to 3/4 inch nominal bore. The jump is worth it when the design calls for a direct reduction without adding a separate bushing and nipple. No other pipe sizes or thread standards are served by this fitting.

Hand Tight Plus Wrench Turns On Clean Threads

Installation starts by hand threading each end onto clean NPT threads, then tightening with a pipe wrench until the joint feels secure. Over tightening can crack the malleable iron or strip the threads, especially if sealant builds up unevenly. The galvanized coating may flake if the wrench slips on the hex body.

Highlights

  • Reduces pipe size from 1 in to 3/4 in NPT
  • Malleable iron construction provides mechanical strength
  • Galvanized coating resists corrosion in wet systems
  • Rated for Class 150 pressure service
  • Female NPT threads on both ends for standard connections

Specifications

BrandZORO SELECT

Questions about this item

What thread size and pitch does the 1 in NPT end of this reducing coupling require for a proper seal?

The 1 in NPT end uses an 11 1/2 thread pitch; wrap PTFE tape clockwise on male threads before tightening to avoid cross-threading.

Which wrench flats should be used when installing this galvanized malleable iron coupling to prevent distortion?

Apply a pipe wrench only to the hex flats on each end; turning the coupling body can crack the Class 150 casting.

How often should the galvanized coating on this reducing coupling be inspected for corrosion in a water supply line?

Check the zinc coating annually; if white rust appears, plan replacement before red rust compromises the Class 150 pressure rating.

Also in this aisle

People compared these

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