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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

  • Product 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.

How it compares

Measured against everything we stock in Faucet Valves & Replacement Parts, at today’s prices. Recalculated every night.

Price $38.99
Cheaper than about 64% of the 1,132 comparable items (median $54.99).

Specifications

Product
Brand nameLEGEND VALVE
Product 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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