Zodiac - Diffuser elbow D400 - R0674500

Zodiac – Diffuser elbow D400 – R0674500

The Zodiac Diffuser elbow D400 (R0674500) is a genuine OEM replacement spare part designed for use with Zodiac’s BOREAL sand filter range. Specifically engineered for the D400 filter model, this diffuser elbow forms a critical part of the internal water distribution system within the filter tank. It directs incoming water from the multiport valve evenly across the sand bed, ensuring consistent filtration performance and preventing channelling through the filter media.

As a precision-moulded component, the diffuser elbow connects the lateral assembly or central standpipe to the upper distribution network inside the filter. Proper function of this part is essential for maintaining the designed flow pattern through the filter, which directly affects water clarity and filtration efficiency. Using a genuine Zodiac replacement ensures dimensional accuracy and material compatibility with the existing filter body and internal components.

Technical characteristics and compatibility

The R0674500 diffuser elbow is specifically sized and profiled for the Zodiac BOREAL D400 sand filter. The Zodiac BOREAL series is a range of sand filters known for their robust construction and reliable filtration at an accessible price point. Sand filters in this range typically achieve a filtration fineness of 20 to 50 microns, making them suitable for the vast majority of residential swimming pools. The diffuser elbow is manufactured from durable, chemically resistant plastic that withstands prolonged exposure to pool water, filter sand abrasion, and the pressures generated during normal filtration and backwash cycles.

According to Zodiac’s official catalogues (2018 and 2020), the R0674500 is listed as the diffuser elbow specific to the D400 model, differentiating it from equivalent parts for the D520 (R0597400) and D640 (R0597500) models. Selecting the correct part for your specific filter diameter is essential — fitting an incorrectly sized diffuser elbow will result in poor water distribution and reduced filtration quality.

Suitability and application

This replacement part is intended for pool owners and service technicians who are maintaining or repairing a Zodiac BOREAL D400 sand filter. The BOREAL D400 is generally suited to small to medium residential swimming pools. If your filter shows signs of poor water return, reduced flow, or visible damage to the internal diffuser assembly, replacing the diffuser elbow with this genuine Zodiac part restores the filter to its original specification. This part is not compatible with other Zodiac filter series or with non-Zodiac sand filters. Always verify your filter model before ordering to ensure a correct fit.