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Brass adapter with male pipe threads and hexagonal body

Legend Valve

Legend Valve 800-878M Adapter 2" MPT PR Body D

SKU CH-BT9W-5MPQH

Connects 2-inch MPT piping to Body D components for hydronic heating systems

  • 2" MPT adapter fits Body D radiator connections
  • Legend Valve construction supports heating system durability
  • PR rating indicates pressure-rated performance
  • California Proposition 65 warning discloses chemical hazard
  • New condition ensures unused factory quality

2" MPT Adapter for Body D

This Legend Valve adapter connects a 2-inch male pipe thread to a Body D component in hydronic heating systems. It is intended for installers and maintenance technicians working on boiler or radiator loops that require this specific transition fitting.

Installation and common issues

The adapter threads directly onto the Body D connection using standard pipe-sealing practice. Leaks typically occur if thread sealant is omitted or applied unevenly, or if the mating threads are damaged or mismatched to the 2-inch MPT specification.

Compatibility checks before ordering

Verify that the existing Body D fitting accepts a 2-inch male pipe thread and that the system pressure rating matches the adapter design. Confirm the piping material is compatible with the adapter body to avoid galvanic corrosion. The product carries a California Proposition 65 warning for chemicals known to cause cancer and reproductive harm.

How it compares

Measured against everything we stock in Radiator Fans & Boiler Parts, at today’s prices. Recalculated every night.

Price $68.99
Pricier than about 81% of the 95 comparable items (median $25.99).

Specifications

Product
Brand nameLEGEND VALVE

Questions about this item

How do I verify the 2" MPT adapter is seated correctly after installation?

Hand-tighten the 2" MPT threads into Body D until snug, then apply a wrench for one additional turn; check for leaks at the joint under system pressure before covering the connection.

What components are included with the 800-878M adapter and what must be sourced separately?

The box contains the Legend Valve 800-878M adapter only; pipe sealant, Teflon tape, and any mating fittings for Body D are not included and must be purchased separately.

Which version of the 800-878M adapter should I select for a Body D connection?

Choose the 800-878M model marked "PR FOR BODY D" — the 2" MPT male thread matches the Body D specification; other 800-series adapters have different thread sizes or body codes.

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