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
Brass hex nipple with male NPT and NST threads

Value Brand

Value Brand 4 in x 4 1/2 in NPT x NST Brass Hex Nipple

SKU CH-RVN2-7MAB1

Connects 4 in NPT and 4 1/2 in NST threads with a rigid brass hex nipple

  • Connects NPT and NST threads for fire-hose compatibility
  • Brass construction resists corrosion in demanding environments
  • Hex profile allows secure tightening with standard tools
  • Rigid straight design maintains alignment under pressure
  • Male-to-male configuration joins two female fittings directly

Fire-hose adapter for 4 in NPT to 4 1/2 in NST

This brass hex nipple connects a 4 in male NPT thread to a 4 1/2 in male NST thread in a straight, rigid configuration. It suits fire-protection installers and maintenance crews who need a permanent, leak-resistant joint between dissimilar pipe standards.

Hex profile and brass construction

The external hex flats allow a spanner to apply controlled torque without damaging the fitting body. Brass resists corrosion in water-based systems and avoids galvanic issues when mated with bronze or brass valves.

Prop 65 chemical warning applies

California law requires disclosure that this product contains a substance known to cause cancer and birth defects or other reproductive harm. Installers handling the fitting should follow local safety protocols and wear appropriate protective equipment.

Highlights

  • Connects NPT and NST threads for fire-hose compatibility
  • Brass construction resists corrosion in demanding environments
  • Hex profile allows secure tightening with standard tools
  • Rigid straight design maintains alignment under pressure
  • Male-to-male configuration joins two female fittings directly

Specifications

BrandZORO SELECT

Questions about this item

Will the brass threads on this 4 in x 4 1/2 in NPT x NST hex nipple gall or corrode over time?

Brass resists corrosion in water service, but dissimilar-metal joints can accelerate wear; use thread sealant and inspect annually for galling.

What pressure or flow limit appears first when this rigid brass adapter runs continuously?

The straight rigid body and hex tightening method transfer full system pressure to the NPT and NST threads; the lower-rated thread standard governs the limit.

How much heat does this brass hex nipple absorb when hot water circulates all day?

Brass conducts heat rapidly, so the fitting will reach fluid temperature quickly; insulation is recommended for personnel protection.

Also in this aisle

People compared these

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