Skip to content
Shop Your Local Store ● Ship to Your Hometown Store
Pro & Contractor Accounts ● Apply for Net Terms
100,000+ Products ● Trusted Authentic Brands

STZ Industries 3 in. FIP each X 3 in. D FIP Galvanized Malleable Iron Union

Gives you a serviceable joint in galvanized pipe runs, so lines can be disconnected for repair without cutting or re-threading.
Stz Industries MPN 351U-3 In Stock & Ready to Ship
$109.99
Free shipping on orders over $75
Ships within 24 hours · most orders arrive in about 2 business days

About Product Overview

The Union 3 GLV from STZ Industries is a 3-inch malleable iron union built for galvanized pipe systems that need a serviceable joint rather than a permanent one. Unions like this let you disconnect a line for repair or maintenance without cutting pipe or reworking threads on either side, which matters on longer runs or anywhere future access is likely. With FIP connections on both ends, it threads directly onto matching female iron pipe, and the galvanized finish holds up against corrosion in areas exposed to moisture. Rated to 300 PSI and 150°F, it's suited for standard water and low-pressure gas or air lines in plumbing and heating setups. It's lead-free, so it meets current requirements for potable water applications. Good for contractors and maintenance crews working on galvanized iron pipe systems who need a dependable break point built into the line.

  • 3-inch diameter, FIP x FIP connections
  • Malleable iron construction with galvanized finish
  • Maximum pressure: 300 PSI
  • Maximum temperature: 150°F
  • Lead-free
  • Made in Vietnam

The Details Specifications

Brand Stz Industries
Model / MPN 351U-3
UPC 019442034023
Weight 5 lbs
Safety Data Sheet (SDS) Manufacturer documentation · opens in new tab
Price check

Go ahead. Check.

You're going to price-check us against Amazon, Home Depot, and Lowe's. Everybody does. Good — open all three tabs. We'll wait. Then look hard at what you're actually being handed over there.

On Amazon, start with these four questions before you click buy.

01

Who's actually selling it

The brand name is on the listing. A different company is in the seller field. Those aren't the same thing, and the second one is who you're buying from.

02

Whether the warranty survives

Most manufacturers only honor a warranty when the unit came through an authorized dealer. We're authorized for Stz Industries. A third-party marketplace seller usually isn't.

03

Where the box came from

Gray-market stock, returns repackaged as new, and outright fakes move through marketplaces constantly. It all looks identical in the photo. It stops looking identical when it fails.

04

Who you call when it breaks

Ours is a phone number with a person behind it who has held this product. M–F, 6 AM – 5 PM Pacific. (866) 469-8556

The big boxes don't care if your hardware store survives.

Amazon, Home Depot, and Lowe's are built to pull every hardware dollar out of your town. When the local shop can't keep the lights on, the counter where somebody actually knew which part you needed goes with it. We're built the other way: real brands so you're never stuck on a marketplace, and a straight answer to buy it down the street when that's the better call. Support independent hardware — it doesn't restock itself.

Why we tell you to shop local
Authorized dealer · Stz Industries

Or skip the tabs entirely and buy it down the street. Find a store near you →

Shop Local · Support Independent

Every order helps keep your local hardware store on the corner.

Why we built NHG
You might find it for less locally. Independent retailers often offer competitive pricing — some products are even cheaper in-store than online.
Real expert advice — not search results. Independent hardware staff know their inventory and the local conditions you're working in.
Keep the neighborhood working. Every dollar spent at an independent retailer returns roughly 3x more to your local economy than at a national chain.

Compare products

{"one"=>"Select 2 or 3 items to compare", "other"=>"{{ count }} of 3 items selected"}

Select first item to compare

Select second item to compare

Select third item to compare

Compare