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Bronze union elbow, 90-degree C x MNPT fitting

Nibco, Inc.

Nibco, Inc. 70746 3/4 in C x MNPT Union Elbow trap

SKU CH-Q3R8-RN46S MPN 70746

A 90-degree cast bronze union elbow with C x MNPT connections for 3/4-inch tube, rated to 466 psi at 200°F and meeting ASME B 16.18 standards

  • Product typeDrain Components
  • Main materialHAWA
  • 90-degree elbow redirects flow in tight spaces
  • Cast bronze body resists corrosion for long service life
  • C x MNPT connections join copper tube to male pipe threads
  • Rated 466 psi at 200 °F for high-pressure systems
  • Meets ASME B16.18 standard for quality assurance

Product identity

The Nibco 70746 is a cast bronze union elbow that joins 3/4 inch copper tube to 3/4 inch male pipe thread in a 90 degree turn. It suits plumbers and maintenance crews who need a removable joint on water, oil or gas lines.

Pressure and temperature limits

The fitting withstands 466 psi at 200 degrees F and operates from -20 to 400 degrees F, so it handles hot water, steam and chilled systems without leaking. ASME B16.18 compliance confirms the pressure rating for code inspections.

Union nut advantage

The union nut lets the elbow be disconnected without cutting pipe, saving labour on trap cleaning, valve replacement or seasonal drainage. Cast bronze construction resists dezincification and threads cleanly into standard MNPT ports.

How it compares

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

Price $32.99
Typical for this category: the median of 4,240 items is $31.99.

Specifications

Product
Brand nameNibco
Model name70746 3/4
Product typeDrain Components
Size & build
Main materialHAWA

Questions about this item

How do I install the 3/4 in C x MNPT union elbow and which step is often missed?

Clean the 7/8 in tube end, apply flux, and solder the C connection; then thread the MNPT side with tape. The step often missed is allowing the solder joint to cool fully before pressurising to 466 psi.

What maintenance or replacement will this cast bronze union elbow need later?

Inspect the solder joint and MNPT threads annually for leaks or corrosion; replace the fitting if the 90 degree elbow body shows cracking or if pressure tests exceed 466 psi at 200 Degrees F.

What limit appears first under sustained use of this 70746 fitting?

The temperature ceiling of 400 Degrees F is reached before the 466 psi pressure rating under continuous hot-water service per ASME B 16.18.

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