1" Watts Wye-Strainer
Item Number: 0379113
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Brand - Watts
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- Nominal Size: 1 inch
- Weight: 35.6 lb
- Lead Free* cast copper silicon alloy body
- Wye-pattern design
- Threaded connections
- Maximum Working Pressure: 400 PSI WOG @ 210°F
- #20 mesh 304 stainless steel screen
- Protects plumbing components from debris
- NSF/ANSI/CAN 61-G certified
Description
Description
The Watts 1 inch Lead Free Wye-Pattern Strainer, Series LF777SI, is designed to protect plumbing systems by filtering dirt, rust, and debris. Constructed from Lead Free* cast copper silicon alloy with #20 mesh 304 stainless steel screen and threaded connections, it ensures durable and reliable performance. This strainer is rated for 400 PSI WOG at 210°F and is NSF/ANSI/CAN 61-G certified, meeting Lead Free* installation requirements for safe use in consumable water systems. Item number 0379113.
Help Me Connect
Help Me Connect
This 1 inch Watts Series LF777SI strainer features threaded end connections.
It is designed for easy installation into piping systems to protect downstream components by connecting to corresponding 1 inch male NPT threads.

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Additional Details
This 1 inch Watts Series LF777SI is a wye-pattern Lead Free* cast strainer designed to protect plumbing system components from dirt, rust, and other damaging debris. It features a robust design to comply with Lead Free* installation requirements.
Features
- Lead Free* cast copper silicon alloy body and cap
- Wye-pattern design for efficient debris collection
- Tapped retainer cap and closure plug for easy maintenance
- Special flared screen opening on the upstream end to provide unrestricted flow through the strainer
- Wetted surface contains less than 0.25% of lead by weight
Specifications
- Nominal Size: 1 inch
- Body Material: Lead Free* cast copper silicon alloy
- Pattern: Wye
- Connection Type: Threaded
- Maximum Working Pressure (WOG): 400 PSI (27.6 bar) @ 210°F (99°C)
- Maximum Working Pressure (WSP): 125 PSI (8.6 bar) @ 353°F (178°C)
- Retainer Cap Material: Lead Free* cast copper silicon alloy
- Plug Material: Lead Free* brass
- Gasket Material: EPDM
- Standard Screen: #20 mesh, 304 stainless steel
- Wetted Surface Lead Content: Less than 0.25%
Dimensions (Approximate)
- Length (A): 3.75 inches (95 mm)
- Height (B): 2.125 inches (54 mm)
- Depth (C): 0.5 inches (13 mm)
- Weight: 1.1 lbs (0.50 kg)
Certificates & Approvals
- NSF Certified to NSF/ANSI/CAN 61-G
FAQs
What is the primary purpose of this 1 inch Watts wye-pattern strainer?
This strainer is designed to protect plumbing system components from damage caused by dirt, rust, and other debris by filtering the flow in the pipeline.
What materials are used in the construction of this strainer?
The body and retainer cap are made from Lead Free* cast copper silicon alloy, the plug is Lead Free* brass, the gasket is EPDM, and the standard screen is #20 mesh 304 stainless steel.
Is this Watts strainer compliant with lead-free standards?
Yes, this product features Lead Free* construction, meaning the wetted surface contains less than 0.25% of lead by weight, complying with Lead Free* installation requirements and NSF/ANSI/CAN 61-G certification.
What are the maximum pressure and temperature ratings for this 1 inch strainer?
It is rated for a maximum working pressure of 400 PSI WOG at 210°F (99°C) and 125 PSI WSP at 353°F (178°C).
What type of connections does the Watts LF777SI strainer utilize?
This model, the LF777SI, features 1 inch threaded end connections for secure installation into compatible piping systems.