Hayward
Hayward SX311CD2FWS Bottom Elbow Assembly
Hayward SX311CD2FWS Bottom Elbow Assembly
Hayward SX311CD2FWS Bottom Elbow Assembly for S311SX and S311SXV Sand Filters
Restore the lower internal flow path of a compatible Hayward ProSeries high-rate sand filter with the model-specific SX311CD2FWS bottom elbow assembly.
Important compatibility note: This part is designed for the Hayward S311SX and S311SXV filter family. It is not the same as the SX310CD2FWS elbow used with the S310S filter. Verify the complete filter model number before ordering.
Product Overview
The Hayward SX311CD2FWS is the bottom elbow assembly specified for compatible Hayward S311 ProSeries side-mount sand filters. This internal component connects with the lower vertical-pipe and lateral-holder system to direct water through the filter’s underdrain assembly during filtration and backwashing.
A damaged, cracked, worn, or improperly fitting internal elbow can contribute to poor circulation, sand returning to the pool, internal leakage, or ineffective filtration. Replacing the correct model-specific assembly helps restore the intended internal water path without replacing the complete filter tank.
Designed for compatible Hayward S311SX and S311SXV sand filters.
Manufactured as a Hayward service replacement for the specified filter assembly.
Connects with the lower internal plumbing and underdrain system.
Key Features
- Genuine Hayward replacement bottom elbow assembly
- Manufacturer part number: SX311CD2FWS
- Specified for compatible S311SX and S311SXV ProSeries sand filters
- Supports the filter’s lower internal water-flow path
- Useful when repairing damaged or worn internal plumbing
- Model-specific design helps maintain proper alignment inside the filter tank
Product Specifications
| Brand | Hayward |
| Part Number | SX311CD2FWS |
| Product Type | Sand-filter bottom elbow assembly |
| Compatible Filter Family | Hayward ProSeries S311 |
| Compatible Models | S311SX and S311SXV |
| Installation Location | Lower internal filter assembly |
| Condition | New replacement part |
Compatibility
Designed for:
- Hayward S311SX ProSeries high-rate sand filter
- Hayward S311SXV ProSeries high-rate sand filter
Do not substitute based only on filter diameter.
The SX310CD2FWS is associated with the S310S filter configuration and should not be assumed interchangeable with the SX311CD2FWS. Internal plumbing dimensions and connection geometry can differ between filter families.
What Is Included?
This listing is for:
- One Hayward SX311CD2FWS bottom elbow assembly
The lateral-holder assembly and other filter components are not included unless specifically shown and stated as included in the selected product configuration. For a combined S311 lower-internal replacement, Hayward identifies the SX311MAS assembly separately.
Installation Notes
- Shut off the circulation pump and disconnect power before servicing the filter.
- Open the manual air-relief valve and fully relieve system pressure.
- Drain the filter tank before removing internal components.
- Inspect the lateral holder, vertical pipe, seals, and connecting surfaces while the filter is open.
- Confirm that all internal parts are seated and aligned before adding filter sand.
- Professional installation is recommended when the filter’s internal configuration or condition is uncertain.
Frequently Asked Questions
What filters use the Hayward SX311CD2FWS?
Hayward identifies the SX311CD2FWS as the bottom elbow assembly for the S311 filter family, including compatible S311SX and S311SXV ProSeries sand filters.
Is SX311CD2FWS interchangeable with SX310CD2FWS?
No interchangeability should be assumed. The SX311CD2FWS is specified for the S311 filter configuration, while the SX310CD2FWS is associated with the S310S. Always match the replacement part to the complete model number printed on the filter label.
Does this include the lateral-holder assembly?
This part number identifies the bottom elbow assembly. Hayward lists the SX311DAS lateral-holder assembly with bottom vertical pipe separately. The combined lower assembly is identified as SX311MAS.
Will this fit an older S311SX filter?
It is the current Hayward service part listed for the S311SX filter family. Because older filters may have undergone previous repairs or component changes, verify the tank model label and compare the existing internal configuration before installation.
When should the bottom elbow assembly be replaced?
Replacement may be appropriate when the elbow is cracked, distorted, leaking internally, no longer seating correctly, or damaged during filter disassembly. The surrounding vertical pipe, holder, laterals, and seals should also be inspected.
Confirm Your Filter Model Before Ordering
Locate the model label on the filter tank and confirm that it reads S311SX or S311SXV. Matching the complete model number is the best way to avoid ordering an incorrect internal elbow assembly.
