Baxi DHW Brass Adapter G1/2 with O-Ring, Domestic Hot Water Connector, Boiler Fitting, Replacement Adaptor Part Number: 720874401

Baxi DHW Brass Adapter G1/2 with O-Ring Oring, Domestic Hot Water Connector, Boiler Fitting, Replacement Adaptor

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£30.79
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Baxi DHW Brass Adapter G1/2 with O-Ring, Domestic Hot Water Connector, Boiler Fitting, Replacement Adaptor Part Number: 720874401
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Baxi DHW Brass Adapter G1/2 with O-Ring Oring, Domestic Hot Water Connector, Boiler Fitting, Replacement Adaptor

SKU W-420852
Manufacturer part number
720874401
EAN
5039177751175
£30.79
inc VAT£25.66 ex VAT
Lead time: 1-5 working days

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Product: Baxi DHW Brass Adapter G1/2 with O-Ring Oring, Domestic Hot Water Connector, Boiler Fitting, Replacement Adaptor (Part no. W-420852)

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Description

Product Overview

The Baxi DHW Brass Adapter G1/2 with O-Ring is a domestic hot water connection adaptor designed for secure, leak-resistant installation in compatible Baxi heating and plumbing systems. Ideal as a replacement boiler fitting, it helps restore safe performance and reliable sealing where a worn or damaged adaptor may be causing drips or pressure loss.

Key Features

  • G1/2 connection size – designed for standard 1/2 inch BSP-style plumbing connections for straightforward replacement.
  • Brass construction – durable, corrosion-resistant material for long service life in DHW environments.
  • Includes O-ring seal – helps prevent leaks and supports a tight, reliable joint.
  • Genuine replacement part – suitable for maintaining manufacturer-intended fit and performance when servicing compatible systems.
  • Service-friendly adaptor – ideal for repairs and maintenance where a quick, accurate swap is needed.

Use Case / Application

Suitable for domestic heating and plumbing repairs where a DHW brass adaptor is required. Commonly used:

  • In utility rooms, airing cupboards or plant areas where the boiler is installed
  • During boiler servicing to replace worn connectors and seals
  • For leak fixes on domestic hot water connection points
  • In residential settings such as houses, flats and apartments

Problem → Solution

Ideal for resolving leaks or poor sealing on domestic hot water connection points by replacing a tired adaptor and O-ring with the correct G1/2 fitting.

Product Specifications

Manufacturer – Baxi
Manufacturer Part Number (MPN) – 720874401
EAN / Barcode – 5039177751175
Dimensions / Size – G1/2
Colour / Finish – Brass
Material / Construction – Brass
Pack Contents / Includes – 1 x DHW brass adapter, 1 x O-ring
Product Type – DHW brass adapter / boiler connector fitting
Typical Applications / Use Cases – Replacement adaptor for domestic hot water connections in compatible boiler and heating system pipework

Why Buy from BHL

Baxi is a trusted name in heating, supplying reliable components designed for straightforward servicing and long-term performance. Order the Baxi 720874401 DHW Brass Adapter G1/2 with O-Ring from BHL for competitive pricing and genuine parts. Buy online today with free* & fast UK delivery and delivery with care from UK warehouses. BHL is a specialist online merchant, trusted by thousands of satisfied customers online since 1998 with thousands of 5 star reviews.

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Buying guide: Boiler Spares

Boiler spares are replacement parts for gas, LPG and oil boilers: printed circuit boards, fans, gas valves, pumps, diverter valves, heat exchangers, sensors, pressure gauges, burners, electrodes, seals, casing panels and flue parts. Most are made for one manufacturer, and often for a narrow range of models, so identifying the boiler correctly matters more than anything else.

Identify the boiler first

Find the data badge, usually behind the front panel or under the controls cover. It shows the manufacturer, the model and the GC (Gas Council) number, a seven-digit reference for the exact appliance. Natural gas and LPG versions of the same boiler usually have different GC numbers, and parts can change between production runs, so the GC number and serial number are the safest way to match a part. The boiler's installation and servicing manual lists the parts for each model.

Part numbers and replacements

Search by the manufacturer's part number where you have it. Manufacturers sometimes replace a part with a newer version under a new number; only use a replacement that the manufacturer lists for your model. Some repairs need a kit rather than a single part, for example a part supplied with new seals or fixings.

Safety

By law, work on gas boilers and their gas parts must be carried out by a Gas Safe registered engineer qualified for that type of appliance; ask to see their ID card before work starts. Oil boilers should be worked on by a suitably qualified technician.

For thermostats and programmers, see heating controls.

Shop all Boiler Spares

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