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Cast iron flange with bolt holes for three-quarter inch pipe

BELL AND GOSSETT

BELL AND GOSSETT 101001 Cast Iron Flange 3/4 in Trap

SKU CH-3PEA-6MT24 MPN 101001

A cast-iron flange with 3/4 in FNPT connection fits Series 100, Ecocirc XL and NRF pump models

  • TypeDrain Components
  • Cast iron construction provides long service life
  • 3/4 inch FNPT connection fits compatible piping
  • 5 inch bolt holes match standard patterns
  • Works with Series 100 and Ecocirc XL pumps
  • Pack of two flanges simplifies installation

Cast Iron Flange for Series 100

This BELL AND GOSSETT 101001 cast iron flange connects to 3/4 in compatible pipe size using FNPT threads. It fits Series 100, Ecocirc XL, NRF and PL pump models listed in the compatibility data. The standard flange design uses 0.5 in bolt holes for secure mounting in hydronic piping systems.

Replaces Worn Flanges on Compatible Pumps

The flange upgrades or replaces damaged connections on Series 100 family pumps including NRF-33, NRF-36, PL-30, PL-36 and PL-55 models. The jump is worth it when existing flanges show corrosion, thread damage or leakage at the bolt pattern. It restores a reliable mechanical seal without changing the pump body.

FNPT Thread Limits and Non-Potable Rating

The FNPT connection suits standard iron pipe threads but cannot join dissimilar thread types without adapters. The flange is not rated for potable water systems so it must stay on closed-loop heating or cooling circuits. Bolt hole spacing follows the Series 100 pattern and will not align with other pump series.

Highlights

  • Cast iron construction provides long service life
  • 3/4 inch FNPT connection fits compatible piping
  • 5 inch bolt holes match standard patterns
  • Works with Series 100 and Ecocirc XL pumps
  • Pack of two flanges simplifies installation

Specifications

TypeDrain Components
BrandBell & Gossett
Model101001

Questions about this item

What bolt-hole diameter does the cast-iron flange need for mounting?

The flange has a bolt-hole size of .5 in, so drill or tap holes to that diameter for a secure fit.

Which thread type is used when connecting the flange to the pipe?

The flange-to-pipe connection uses FNPT threads; apply pipe sealant and tighten to spec without over-torquing the cast iron.

Will the gasket or flange need periodic replacement in a hydronic system?

Cast iron resists corrosion, but the mating gasket should be inspected during routine pump maintenance and replaced if it shows compression set or weeping.

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