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Brass frost-free sillcock valve with MNPT and sweat connections, 8 inch stem

Legend Valve

Legend Valve 108-166A T-550 frostfree sillcock valve 3/4 MNPT sweat 8

SKU CH-NXXK-DKQAV

Frost-free sillcock valve with quarter-turn operation and combined 3/4 inch male pipe thread and sweat connections for 8 inch wall installation

  • TypePipes, Valves & Fittings
  • Frost-free design prevents pipe bursts in winter
  • Quarter-turn operation allows quick water shut-off
  • 3/4 inch MNPT and sweat connections fit standard supply lines
  • Eight-inch stem length suits thicker wall installations
  • New condition ensures reliable performance from first use

What this valve is and who needs it

The Legend Valve 108-166A T-550 is a frost-free sillcock valve designed for outdoor water supply lines. It combines a 3/4 inch male NPT thread with a sweat connection and an 8 inch stem length. The quarter-turn operation provides simple on-off control for residential and light commercial installations.

Installing the valve and common pitfalls

The valve installs by threading the 3/4 inch MNPT end into a female fitting or by sweating the copper connection directly to pipe. Ensure the valve is pitched slightly downward so water drains from the stem when shut off. A frequent error is over-tightening the packing nut, which can make the quarter-turn handle stiff or cause leaks around the stem.

What to verify on your existing plumbing before

Confirm that your supply line uses a 3/4 inch female NPT thread or accepts a 3/4 inch sweat joint. Measure the wall thickness to ensure the 8 inch stem reaches the heated interior space for freeze protection. Check local codes for compliance with the Proposition 65 warnings regarding chemical content.

Highlights

  • Frost-free design prevents pipe bursts in winter
  • Quarter-turn operation allows quick water shut-off
  • 3/4 inch MNPT and sweat connections fit standard supply lines
  • Eight-inch stem length suits thicker wall installations
  • New condition ensures reliable performance from first use

Specifications

BrandLEGEND VALVE
TypePipes, Valves & Fittings

Questions about this item

How do I verify the T-550 frostfree sillcock is working after installation?

Turn the 1/4-turn handle to open the valve, confirm water flows from the spout, then close it and watch that the flow stops completely without dripping.

What comes with the 108-166A valve and what must I supply?

The valve body with 3/4" MNPT and sweat connections is included; you must provide pipe, fittings, flux, solder and any mounting hardware.

Which Legend Valve frostfree sillcock length should I select for an 8-inch wall?

Choose the 8-inch T-550 model (108-166A) to match an 8-inch wall thickness.

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