The Watts LF777S-40 3 is a 3" lead-free wye-pattern strainer with NPT connections that removes pipeline debris and particulates to protect downstream equipment. It ships with a 40 mesh 304 stainless steel screen. It features a copper body and a epdm seat. Rated to 400 psi. This model is certified lead-free for potable-water installations.
This 3 inch lead free wye pattern strainer is designed to protect system components from dirt, rust, and other damaging debris in the piping system. It has a retainer cap tapped for closure plug, threaded end connections, and a 40 mesh stainless steel screen.
Features
- Lead free construction
- Wye pattern
- Threaded end connections
- Retainer cap tapped for closure plug
- Includes: Strainer
Common Questions
- What mesh or screen size does it come with?
- LF777S-40 3 ships with a 40 mesh 304 Stainless Steel screen (40 openings per linear inch). The screen is called out by the number in the model code.
- Can I get a finer or coarser screen?
- Yes. Watts builds this body with a range of screens and encodes the choice in the model number, so a finer or coarser screen is a different part number rather than an accessory. This one is 40 mesh. Finer screens catch smaller particles but clog faster and cost more pressure drop, so size the screen to the debris you actually have.
- Can I use this on steam?
- Yes. LF777S-40 3 is rated 125 psi WSP on steam, which is a separate and much lower limit than its 400 psi WOG (cold water, oil, gas) rating. Do not size steam service off the WOG number.
- Does it have a blowoff / blowdown port?
- Yes. The retainer cap/cover is tapped for a blowoff connection, so you can flush accumulated debris by pulling the plug or piping a blowdown valve to it -- no need to break the strainer apart. The closure plug is not included with this model.
- What is the "seat material" on a strainer?
- A strainer has no seat -- nothing closes against anything. The EPDM called out here is the retainer-cap seal (the gasket between the cap and the body), which is what limits the temperature and chemical compatibility of the closure.
Specifications
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Type: Strainer
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Size: 3"
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Connection: NPT
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Body Material: Copper
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Cap Seal / Gasket Material: EPDM
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Max Pressure (WOG, psi): 400
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Application: Domestic Water
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Country of Origin: United States
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Warranty: 1 Year Limited
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MPN: LF777S-40 3
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Certifications: NSF-372
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Lead-Free: Yes
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Strainer Pattern: Wye
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Screen Type: Mesh
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Screen Mesh: 40
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Screen Material: 304 Stainless Steel
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Blowoff / Drain Tapping: Yes
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Blowoff Plug Included: No
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Max Steam Pressure (WSP, psi): 125
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Body Coating: None
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Alternate Screens Available: Yes
