Left/Right & Di-Electric Fittings

If you've been searching for those elusive left/right threaded black iron fittings, you've come to the right place. PlumbingSupply.com® is your source for hard-to-find fittings such as these left/right threaded nipple and coupling sets, left/right fittings, dielectric fittings, and many more fittings (PVC, brass, copper and stainless steel), fixtures (sinks, tubs, toilets and faucets), tools and thousands of other plumbing-related products.

Left/Right Nipple And Coupling Set

These have standard right-hand threads on one side & reverse (left-hand) threads on the other. These are generally used for gas piping, when unions are not allowed.

Image Description Price & Quantity
left right nipple coupling set 050 1/2" x 4" Nipple + L/R Coupling $12.76 Enter a quantity and
left right nipple coupling set 075 3/4" x 4" Nipple + L/R Coupling $15.24 Enter a quantity and
left right nipple coupling set 100 1" x 4" Nipple + L/R Coupling $22.35 Enter a quantity and
left right nipple coupling set 125 1-1/4" x 4" Nipple + L/R Coupling $27.60 Enter a quantity and
left right nipple coupling set 150 1-1/2" x 4" Nipple + L/R Coupling $36.03 Enter a quantity and
left right nipple coupling set 200 2" x 4" Nipple + L/R Coupling $47.86 Enter a quantity and

Need to seal your pipe threads? visit our page for PTFE tape and pipe dope.

Left / Right Nipple and Coupling Sold Separately

L/R Nipples
Image Size Price & Quantity
left right nipple 050 1/2" x 4" $3.07 Enter a quantity and
left right nipple 075 3/4" x 4" $3.66 Enter a quantity and
left right nipple 100 1" x 4" $5.11 Enter a quantity and
left right nipple 125 1-1/4" x 4" $7.29 Enter a quantity and
left right nipple 150 1-1/2" x 4" $8.56 Enter a quantity and
left right nipple 200 2" x 4" $11.41 Enter a quantity and
Note: You need both a left/right nipple & a left/right coupling to use these
L/R Couplings
Image Size Price & Quantity
left right coupling 050 1/2" $11.11 Enter a quantity and
left right coupling 075 3/4" $13.27 Enter a quantity and
left right coupling 100 1" $19.73 Enter a quantity and
left right coupling 125 1-1/4" $23.38 Enter a quantity and
left right coupling 150 1-1/2" $31.47 Enter a quantity and
left right coupling 200 2" $41.76 Enter a quantity and
Note: You need both a left/right nipple & a left/right coupling to use these
Need to seal your pipe threads? Visit our page for PTFE tape and pipe dope.

Di-Electric Unions - Forged Steel
Sweat x Fips

Di-Electric Unions help stop corrosion of the galvanized piping when transitioning to copper pipe.
Not for potable/drinking water
can use for hydronic heating, irrigation, air lines, etc.
Image Fitting Size Price & Quantity
di electric fitting fips x swt 050 1/2" $2.47 Enter a quantity and
di electric fitting fips x swt 200 2" $12.56 Enter a quantity and
di electric union flange 300 3" - flanged style $95.97 Enter a quantity and
For Potable/Drinking Water
Image Fitting Size Price & Quantity
di electric fitting potable fips x swt 050 1/2" $4.13 Enter a quantity and
di electric fitting potable fips x swt 075 3/4" $6.56 Enter a quantity and
di electric fitting potable fips x swt 100 1" $9.14 Enter a quantity and
di electric fitting potable fips x swt 125 1-1/4" $9.37 Enter a quantity and
image unavailable 1-1/2" $15.74 Enter a quantity and
di electric fitting potable fips x swt 200 2" $22.00 Enter a quantity and

Looking for copper unions?

Di-Electric Unions - Galvanized
Fips x Fips

Image Fitting Size Price & Quantity
di electric fitting fips 050 1/2" $5.12 Enter a quantity and
di electric fittings fips 075 3/4" $5.29 Enter a quantity and
di electric fittings fips 100 1" $8.24 Enter a quantity and
di eletric fitting fips 125 1-1/4" $15.15 Enter a quantity and
di electric fittings fips 150 1-1/2" $19.66 Enter a quantity and
di electric fittings fips 200 2" $22.66 Enter a quantity and

Need to seal your pipe threads? Click here for PTFE tape and pipe dope.

Insulated Di-Electric Couplings - Galvanized
Fips x Fips

Galvanized steel body internally insulated with ABS plastic

Maximum working temperature 180°F

Image Fitting Size Price & Quantity
insulated coupling 050 1/2" $10.48 Enter a quantity and
insulated coupling 075 3/4" $19.44 Enter a quantity and
insulated coupling 100 1" $22.57 Enter a quantity and
insulated coupling 125 1-1/4" $18.21 Enter a quantity and
insulated coupling 150 1-1/2" $26.25 Enter a quantity and
insulated coupling 200 2" $30.84 Enter a quantity and

Need to seal your pipe threads? See below.

View our stainless water heater flexes - they act as dielectric fittings as well.

Thread Sealants (IPS Threads)

Product Description Price & Quantity
PTFE thread sealing tape PTFE thread sealing tape
  • 3.5 Mil thick
  • Density: 0.4
 1/2" x 260" roll $0.59 Enter a quantity and
1/2" x 520" roll $1.03 Enter a quantity and
Gray 4 mil thick PTFE thread seal tape GRAY PTFE thread sealing tape
  • 4 Mil THICK
  • Density: 1.2
  • 1/2" x 260" roll
  • Proudly made in the USA USA flag button
 $1.73 Enter a quantity and
1 oz. pipe dope 1 oz. Great White™ Basic Pipe Joint Compound
  • Small, convenient tube
  • Great for most plastics and metals
$2.18 Enter a quantity and
Thread Sealing Compound 4 oz. High Quality TU-555 Pipe Joint Compound
  • Available in larger sizes, too
  • Great for most plastics and metals
Order 12, 24 or 48 of this item for additional savings!
Pricing discounts will show up in your shopping cart. 		$7.65 Enter a quantity and

To ensure our customers receive fresh products, TU-555 pipe joint compounds are non-returnable.

Related Items & Accessories

Brass nipple
Brass Nipples Brass compression elbow
Brass Compression Fittings Brass flare tee fitting
Flare Fittings Gas ball valve
Gas Valves Safety Quik Gas Connector Kit
Commercial Gas Connectors Air pressure gauge
Testing Kits Pipe sizing guide
How to Measure Pipe Size Portable pipe threader
Portable Pipe Threaders
Frequently Asked Questions

Q. "Any left- and right-hand tricks?"
A. The trick for left- and right-hand fittings and couplings is to get the correct bite the first time. The way to do that is to insert one side of the nipple/coupling and hand-tighten. Count the number of turns to get it to hand-tight. Then take apart and do the same on the other side. If one side took more turns to get it to hand-tighten, then add (or subtract) that number before starting; and turn that amount into the side that took more turns. In other words, the secret is to tighten the same amount after hand-tightening.

Q. "I want to attach galvanized piping to copper piping, but my friend said I need a dielectric union. Is this correct?"
A. Yes, some type of isolation must be placed between galvanized steel pipe and copper piping. Many plumbers use dielectric unions or insulated couplings for this purpose. Dissimilar metals, ferrous and non-ferrous, joined together will cause one of the metals to corrode. Usually in piping applications the ferrous metal will corrode, in this case the galvanized. Ferrous metals have iron in them, and non-ferrous metals do not. When galvanized is attached to copper the galvanized is electro-negative and the copper is electro-positive which causes the galvanized to corrode, also known as galvanic corrosion. Water heaters also need some type of dielectric connection from the steel tank if copper pipe is being used. Stainless steel water flexes work well as a dielectric isolation between the steel tank and the copper piping.

Q. "I'm hearing a lot about lead-free these days. What does that have to do with plumbing products and how does the new lead-free legislation affect me?"
A. Basically, the laws implemented Jan. 1st, 2014 require plumbing products that come in contact with drinking water to be "essentially lead free" (less than 0.25% weighted average). For further information about how the law determines what is "lead free", rules regarding which plumbing products must be "lead free", and who these laws will affect, please view our page.

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