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1 1/4 In Bronze Wye Pattern Strainer, Thread, 20 Mesh Screen, Tapped Retainer Cap, Closure Plug
LF777SI 1 1/4 - spec sheet
LF777SI 1 1/4 - spec sheet
Manufacturer Resources
Product Specs
- Blowdown Outlet Connection:
- Female Threaded
- Blowdown Outlet Size:
- 1/2 IN
- Body Material:
- Brass
- Body Pattern:
- Wye
- Buy American Act Compliant:
- No
- Ean:
- 98268285628
- Epoxy Coating Type:
- None
- Gasket Material:
- NBR
- Inlet Connection Size:
- 1 1/4 IN
- Inlet Connection Size Metric:
- 32 MM
- Inlet Connection Type:
- Female Threaded
- Inlet Thread Type:
- NPT
- Lead Free:
- Yes
- Maximum Operating Temperature Celsius:
- 178
- Maximum Operating Temperature Fahrenheit:
- 210
- Maximum Pressure And Temperature:
- 400 PSI at 210 degree F; 125 PSI at 353 degree F
- Maximum Pressure Bar:
- 27.6
- Maximum Pressure Psi:
- 400
- Maximum Working Pressure And Temperature:
- 400 PSI at 210 degrees F
- Outlet Connection Size:
- 1 1/4 IN
- Outlet Connection Type:
- Female Threaded
- Outlet Thread Type:
- NPT
- Part Number:
- 379114
- Plug Material:
- Brass
- Pressure Temperature Rating:
- 400 PSI at 210 degree F
- Pressure Temperature Rating Bar:
- 27.6 BAR at 99 degree C
- Retainer Cover Material:
- Lead Free Cast Copper Silicon Alloy
- Retainer Cover Type:
- Tapped with Closure Plug
- Screen Material:
- Stainless Steel
- Screen Size:
- 20 MESH
- Series:
- LF777SI
- Strainer Type:
- Wye
- Wog Rating:
- 400 PSI at 210 degrees F
- Department:
- Plumbing
- Product Group:
- Plumbing
- Product Subgroup:
- Filtration
- Product Type:
- Y-Strainer
- Brand Name:
- Watts
Watts LF777SI 1 1/4 – Frequently Asked Questions
1) What pipe size and thread does the Watts LF777SI 1-1/4 strainer connect to?
Both ends are 1-1/4 inch (32 mm) female NPT threads, inlet and outlet. So it threads straight into 1-1/4 inch iron pipe size threaded piping with no adapters, using nipples or unions on each side so you can break the line out later for screen cleaning.
2) Is this Watts Y-strainer lead free for potable water lines?
Yes. The LF777SI is a lead free bronze wye strainer, with a lead free cast copper silicon alloy retainer cover, which is what puts it on potable water service rather than mechanical-only duty. Body and closure plug are brass, the screen is stainless steel, and the gasket is NBR.
3) What pressure and temperature can this bronze wye strainer take?
Rated 400 PSI at 210 degrees F (27.6 bar at 99 degrees C) on water, oil and gas service. That covers domestic water, chilled water and typical low pressure hydronic loops. Maximum operating temperature is 210 F / 178 C on the published data.
4) Can I add a blowdown valve to this strainer instead of pulling the cap to clean it?
Yes. The retainer cap comes tapped with a closure plug in place, and the blowdown outlet is 1/2 inch female threaded. Back the plug out and thread in a 1/2 inch NPT ball valve or hose bibb and you can flush the pocket under pressure instead of shutting down and removing the cover. Leave the plug in if you do not want the tap.
5) How fine is the screen, and is 20 mesh fine enough to protect a backflow preventer or control valve?
The screen is 20 mesh stainless steel, which is the general-purpose size for keeping pipe scale, weld slag and grit out of downstream valves, meters, pumps and backflow assemblies. It is a debris screen, not a filter; if your equipment calls for finer particle removal, you want a cartridge filter downstream of the strainer rather than this alone.
6) Does a wye strainer have to be installed a particular way around?
Yes, direction and orientation both matter. Flow has to enter the inlet end so debris is carried into the screen pocket, and the pocket should hang down or to the side, never above the pipe, or collected dirt falls back into the line when you open the cap. On horizontal pipe the leg points down; on vertical downward flow it self-drains into the pocket. The 1/2 inch tapped cap gives you the low point to blow it out.
7) Is the Watts LF777SI Buy American Act compliant for a government or public job?
No. The LF777SI 1-1/4 is listed as not Buy American Act compliant, so it will not satisfy a BAA or domestic-sourcing clause on a federal or public-works spec. It is fine for private commercial and multi-family work where that clause does not apply.
8) Is this strainer epoxy coated for chilled water or condenser duty?
No coating is applied, the body is bare brass. That is normal for potable and hydronic water service. For raw or aggressive water where a fusion epoxy lining is specified, this one does not meet that requirement.
9) What is the Watts part number for the 1-1/4 inch LF777SI?
Order it as Watts LF777SI 1-1/4, factory part number 379114. The SI in the series designates the lead free cast copper silicon alloy construction, with the tapped retainer cap and closure plug included.
How fast can I get the Watts LF777SI 1 1/4 delivered?
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Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit,
reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Watts LF777SI 1 1/4 come with a warranty?
Absolutely. The Watts LF777SI 1 1/4 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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