Hayward
Hayward SX311DAS Lateral Assembly with Bottom
Hayward SX311DAS Lateral Assembly with Bottom
Hayward SX311DAS Lateral Holder Assembly with Bottom Vertical Pipe
Current service replacement for compatible Hayward S311SX and S311SXV ProSeries high-rate sand filters.
Compatibility notice: The Hayward SX311DAS is designed for compatible S311SX and S311SXV sand filters. Verify the complete model number printed on the filter tank before ordering.
Product Overview
The Hayward SX311DAS is a genuine replacement lateral holder assembly with bottom vertical pipe for compatible Hayward S311 ProSeries sand filters. This lower internal assembly sits beneath the filter media and supports the lateral system responsible for distributing water through the sand bed.
SX311DAS is the current service configuration for the S311 lateral holder system. It includes the lateral holder assembly and the matched bottom vertical pipe, making it suitable for repairs involving a cracked holder, damaged hub, broken pipe, or worn lower underdrain assembly.
Updated Hayward replacement configuration for compatible S311 filters.
Includes the matched lower vertical pipe used with the lateral holder assembly.
Designed specifically for the listed Hayward ProSeries sand filter family.
Key Features
- Genuine Hayward replacement lateral holder assembly
- Manufacturer part number: SX311DAS
- Includes the bottom vertical pipe
- Designed for compatible Hayward S311SX and S311SXV filters
- Supports proper water distribution through the filter underdrain system
- Current service replacement for the older S311 lateral holder configuration
- Allows internal filter repair without replacing the complete tank
Product Specifications
| Brand | Hayward |
| Part Number | SX311DAS |
| Product Type | Sand filter lateral holder assembly |
| Included Pipe | Bottom vertical pipe |
| Compatible Filter Family | Hayward ProSeries S311 |
| Compatible Models | S311SX and S311SXV |
| Installation Location | Lower internal underdrain assembly |
| Condition | New replacement part |
Compatible Hayward Filters
- Hayward S311SX ProSeries high-rate sand filter
- Hayward S311SXV ProSeries high-rate sand filter
Do not order by filter diameter alone.
Hayward uses different internal assemblies across the S310, S311, and S360 filter families. Always match the replacement part to the complete model number shown on the filter tank label.
What Is Included?
- One Hayward SX311DAS lateral holder assembly
- One bottom vertical pipe
The bottom elbow assembly is not included with SX311DAS. The matching S311 bottom elbow is sold separately as SX311CD2FWS. The combined lower internal assembly is sold separately as SX311MAS.
SX311DAS vs. SX311MAS
| Part Number | Included Components | Best Used When |
|---|---|---|
| SX311DAS | Lateral holder assembly and bottom vertical pipe | The existing bottom elbow remains usable |
| SX311MAS | Lateral holder, bottom vertical pipe, and bottom elbow assembly | A complete lower internal replacement is needed |
Common Reasons for Replacement
- Cracked or damaged lateral holder hub
- Broken or distorted bottom vertical pipe
- Sand returning to the pool due to damaged internal components
- Poor internal alignment after a previous filter repair
- Rebuilding an older S311SX underdrain assembly
Installation Notes
- Turn off the circulation pump and disconnect power before opening the filter.
- Open the manual air-relief valve and verify that all pressure has been released.
- Drain the filter and remove the filter media before servicing the underdrain assembly.
- Inspect the existing bottom elbow, laterals, seals, and connection surfaces while the tank is open.
- Confirm that all laterals are fully seated and positioned correctly before adding filter media.
- Add water to the tank before pouring in new filter sand to help cushion the lateral assembly.
- Professional installation is recommended when the existing internal configuration is uncertain.
Frequently Asked Questions
What does the Hayward SX311DAS include?
The SX311DAS includes the lateral holder assembly and the bottom vertical pipe. The bottom elbow assembly is sold separately.
What filters use the SX311DAS?
The SX311DAS is intended for compatible Hayward S311SX and S311SXV ProSeries high-rate sand filters. Always verify the full model number before ordering.
Is SX311DAS the replacement for SX311DA?
SX311DAS is the current service configuration for the S311 lateral holder assembly. It includes the bottom vertical pipe and may not look identical to every older assembly, but it is designed for the compatible S311 filter family.
Does SX311DAS include the bottom elbow?
No. The matching S311 bottom elbow is sold separately as SX311CD2FWS. Choose SX311MAS when the lateral holder, bottom vertical pipe, and bottom elbow are all needed.
Are the individual laterals included?
This listing includes the components specifically stated above. Replacement lateral packs may be sold separately. Review the listing images and included-components section before ordering.
Will this fit a 2021 Hayward S311SX filter?
SX311DAS is the current service assembly for compatible S311SX filters. Confirm that the filter tank label reads S311SX or S311SXV and inspect the existing bottom elbow before choosing between SX311DAS and the more complete SX311MAS assembly.
Verify the Complete Filter Model
Confirm that the filter tank label reads S311SX or S311SXV. Matching the complete model number is the best way to avoid ordering an incorrect internal assembly.
