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Silver malleable iron sealing fitting with threaded ends

Appleton Century Crofts

Appleton Century Crofts 6-1/4" Sealing Fitting 40% Fill 1-1/2" FNPT x 1-1/2" MNPT Malleable Iron Conduit

SKU CH-7MTN-TNM27

Sealing fitting blocks gases and flames in hazardous conduit systems with 40% fill capacity and 8.000 length

  • Product typeConduit Fittings
  • Color and finishSilver
  • Main materialIron
  • Overall length8
  • Seals hazardous gases with 40% fill capacity
  • 1-1/2" FNPT x MNPT fits IMC and RMC conduit
  • Malleable iron body rated Class I Division 1 and 2
  • Silver finish resists corrosion in harsh environments
  • 000 length enables vertical or horizontal installation

1-1/2" Conduit Sealing Fitting

This malleable iron sealing fitting connects 1-1/2" FNPT to 1-1/2" MNPT conduit ends. It is rated for Class I Division 1 and 2 Groups B C D and Class II Division 1 and 2 Groups E F G hazardous locations. The fitting prevents the passage of gases vapors or flames between conduit system sections. It suits vertical or horizontal installation in industrial electrical systems.

Upgrade From Standard Couplings

Standard couplings do not block flame or gas migration in classified areas. This fitting replaces them when code requires a seal at 40% fill capacity. The jump is worth it when running IMC or RMC conduit through boundaries between hazardous and non-hazardous zones. It meets the sealing requirement without changing the conduit trade size.

Installation Notes

Thread the FNPT end onto the conduit and the MNPT end into the mating fitting or hub. Apply approved sealing compound inside the fitting chamber after conductors are pulled. The 8.000 inch overall length requires adequate straight clearance in the run. The most common error is underfilling the sealing compound which voids the hazardous location rating.

How it compares

Measured against everything we stock in Electrical Conduit & Fittings, at today’s prices. Recalculated every night.

Price $61.99
Pricier than about 73% of the 1,290 comparable items (median $28.99).

Specifications

Product
Brand nameAPPLETON ELECTRIC
Product typeConduit Fittings
Color and finishSilver
Size & build
Main materialIron

Questions about this item

What length of conduit run does the 6-1/4 inch overall fitting occupy?

The sealing fitting has an overall length of 6-1/4 inches and a listed length specification of 8.000 inches, so allow at least that much straight run between conduit ends.

Which thread do I engage first when installing the 1-1/2 inch FNPT by 1-1/2 inch MNPT fitting?

Start the male NPT end into the female hub of the adjacent conduit body, then thread the female end onto the male conduit nipple; reversing the order makes alignment difficult in tight hazardous-location runs.

When must the sealing compound inside this 40 % fill fitting be replaced?

Replace the sealing compound whenever the fitting is disassembled for inspection or conduit modification, because the original fill cannot be reused once disturbed.

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