We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Ten brass hex head plugs in a pack

Value Brand

Value Brand Hex Head Plug Brass 10 PK

SKU CH-9MQ9-9138M

Ten-pack of brass hex-head plugs with 3/8-18 threads rated to 250 degrees F

  • TypeOther
  • 10-pack supplies multiple fittings for plumbing jobs
  • Brass construction resists corrosion in water systems
  • Rated for temperatures from -65 to 250 degrees F
  • 3/8-18 NPT threads fit standard pipe connections
  • Pre-applied thread sealant not included for custom sealing

Brass Hex Head Plugs — Pack of 10

These brass hex head plugs suit plumbers and maintenance teams closing 3/8-inch NPT ports. The pack of ten covers multiple outlets in a single order. They arrive new and ready for immediate installation. California Proposition 65 warnings apply.

3/8-18 NPT Thread Specification

The decisive detail is the 3/8-18 National Pipe Taper thread. Only ports cut to this exact standard will seal correctly with these plugs. Mismatched thread forms or diameters will leak or damage the fitting. Verify the port marking before purchase.

Temperature Range and Quantity Headroom

Rated from minus 65 °F to 250 °F, the plugs handle chilled water lines and low-pressure steam alike. Ten pieces give enough spares for a typical manifold or header block. Very high-pressure or cryogenic systems fall outside the rated envelope.

Highlights

  • 10-pack supplies multiple fittings for plumbing jobs
  • Brass construction resists corrosion in water systems
  • Rated for temperatures from -65 to 250 degrees F
  • 3/8-18 NPT threads fit standard pipe connections
  • Pre-applied thread sealant not included for custom sealing

Specifications

BrandZORO SELECT
TypeOther

Questions about this item

How does the 3/8-18 thread size work once the plug is installed in a real piping system?

The 3/8-18 NPT threads create a tapered seal that tightens as you turn the plug, forming a pressure-tight closure in a matching 3/8 inch nominal pipe fitting without needing a separate gasket.

What does the 3/8-18 designation cap in practice for this brass plug?

The 3/8-18 marking confirms National Pipe Taper threads at 18 threads per inch, limiting the plug to fittings cut to the same 3/8 inch NPT standard so the taper engages correctly.

What physical clearance does the hex head need to fit and turn during installation?

The external hex head requires enough surrounding space for a wrench or socket to engage the flats fully, so the fitting must be accessible from the side rather than recessed in a tight cavity.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.