Watts 0379115 1 1/2 IN Bronze Wye Pattern Strainer, Thread, 20 Mesh Screen, Tapped Retainer Cap, Closure Plug

The body and the retainer cover are both lead free cast copper silicon alloy, which is what the LF prefix on the LF777SI series refers to. The screen is stainless steel and the gasket is NBR. That combination is what you want ahead of a backflow preventer, meter, or mixing valve on a domestic water line.

Yes, that is what the tapped retainer cap is for. The cover comes tapped with a 3/4 inch female threaded blowdown outlet (20 mm) and ships with a closure plug installed. Back the plug out, thread in a 3/4 inch NPT ball valve, and you can flush the screen under line pressure without breaking the cover loose. Leave the plug in if you would rather clean it by hand.

400 PSI WOG at 210 degrees F, and 125 PSI WSP for steam service. Minimum temperature is 32 degrees F. In bar that is 27.6. So it covers domestic hot and cold water, chilled water, and low pressure steam, but check your steam pressure against the 125 PSI figure before you spec it on a boiler line.

No. The 0379115 is not UL listed and is not approved for UL fireline service. Fire protection work needs a UL/FM listed strainer, so this one should stay on domestic water, hydronic, and general mechanical piping.

20 mesh stainless steel is a general-purpose screen: it stops pipe scale, solder beads, weld slag, thread chips, and sand-sized grit left in a new or repiped system. It is not a filter, so it will not take out silt or fine sediment. If you are protecting a meter, pump seal, or control valve from construction debris, 20 mesh is the usual call. For finer capture you need a perforated or finer-mesh element, not this one.

Yes, and getting it wrong is the most common field mistake. A wye body has a directional flow arrow, so it has to go in with flow through the inlet toward the outlet. The screen pocket leg also has to point down or horizontally to the side on a horizontal run so debris collects in the pocket and the blowdown drains. On a vertical down-flow run the pocket naturally hangs below. Leave clearance at the retainer cap end so you can pull the stainless screen without cutting pipe.

The strainer comes with its NBR cover gasket and the closure plug for the tapped cap, so nothing extra is required for the initial install. Plan on a replacement NBR gasket in your PM kit if the unit gets opened repeatedly, since that gasket is the seal between the cover and the bronze body. Note the plug listing applies to the cap closure only, there is no separate body drain plug.

No coating. Epoxy coating type is listed as none, because the body is solid lead free cast copper silicon alloy and does not need a lining the way a cast iron strainer does. That is a practical reason to run bronze on potable and chilled water instead of a coated iron body.