Watts LF777SI 2 2 In Bronze Wye Pattern Strainer, Thread, 20 Mesh Screen, Tapped Retainer Cap, Closure Plug

Yes. The LF777SI is a lead free bronze/brass body strainer, which is what makes it suitable for potable water service rather than mechanical-only duty. The screen is stainless steel and the gasket is NBR.

Rated 400 PSI (27.6 bar) at 210 degrees F, with a maximum operating temperature of 210 F (99 C). That covers domestic cold and hot water and most hydronic heating loops. For steam or higher-temperature service the rating drops off, so check the reduced value before applying it there.

Yes. The retainer cover is tapped and comes with a brass closure plug, and the blowdown outlet is 1 inch female threaded. Pull the plug and pipe in a 1 inch NPT ball valve and you can blow the screen down under pressure instead of shutting the line and removing the cap. On a system you expect to foul, that is the setup worth doing at install.

Flow direction matters, and so does orientation. A wye strainer must be piped with the arrow on the body following flow, and the screen pocket pointing down on horizontal runs (or downstream on vertical down-flow) so trapped debris collects in the leg rather than washing back into the line. Leave clearance at the retainer cap end for screen removal, or pipe the 1 inch blowdown so you can flush without pulling it.

The LF777SI ships with a 20 mesh stainless screen, which catches scale, weld slag, pipe chips and grit, the debris that fouls check seats and pump seals on a new or repaired line. It is not a filter for fine sediment or particulate down to microns, so if you need polishing filtration put a cartridge filter downstream and keep the strainer as the coarse first stage.

A wye body like the LF777SI sits inline at an angle and is the usual choice on smaller lines, 2 inch and down, where headroom is tight and you can clean it at the cap or blowdown. Basket strainers hold far more debris and are cleaned from the top, which suits large horizontal mains and high-dirt-load service where you do not want frequent blowdowns. For a 2 inch threaded branch feeding a pump, boiler or backflow device, the wye is the standard fit.

No. The LF777SI 2 is listed as not Buy American Act compliant, so it will not satisfy a BAA or domestic-content clause on a federally funded job. For those specs you need a domestically manufactured strainer instead.

There is no epoxy coating on the LF777SI 2; it is a bare lead free brass/bronze body. For exposed mechanical room, hydronic, and potable water piping that is normal. If your spec calls for a coated body for corrosive or buried service, this is not the part.

Order it as Watts LF777SI 2, factory part number 379116. That is the 2 inch female NPT threaded, 20 mesh version with the tapped retainer cap and closure plug.