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 quick-connect set with 10 couplers and 10 steel plugs, knurled brass finish

Steelman

Steelman 99473-B Quick Connect Fitting Set 20-Piece 1/4 NPT Brass Coupler

SKU CH-NCRQ-TQ01Z

A 20-piece brass coupler and steel plug set with 1/4-inch NPT threads for quick air-line changes

  • 20-piece set includes 10 couplers and 10 plugs for immediate multi-tool readiness
  • Brass couplers with knurled grip slide smoothly even with oily hands or gloves
  • Zinc-plated steel plugs resist rust and corrosion for long service life
  • High-flow design with wider inner diameter delivers more air to pneumatic tools
  • 1/4-inch NPT threads and Milton M-type compatibility fit existing shop airlines

20-Piece Quick Connect Set

The Steelman 99473-B set supplies 20 pieces of 1/4-inch NPT brass couplers and steel plugs for air compressor systems. It is built for workshops and automotive garages that run multiple pneumatic tools from a single air supply. The fittings are compatible with Milton or M type connections so existing hoses and tools connect without adapters. Each coupler and plug is ready for daily professional use.

Sustained Air Delivery

The high-flow design uses a wider inner diameter than standard fittings to move more air volume to tools during continuous operation. This helps maintain consistent pressure at impact wrenches, spray guns or sanders when the compressor runs for extended periods. Brass couplers and zinc-plated steel plugs resist internal corrosion that can restrict flow over time. The smooth slide action stays reliable through repeated connect and disconnect cycles.

Durability in Daily Use

Solid brass coupler bodies resist corrosion from moisture in compressed air lines while the knurled texture gives a secure grip with oily hands or gloves. Steel plugs carry a zinc protective plating that fights rust in humid shop environments. The coupler hex shape accepts an 11/16-inch wrench for firm installation without rounding corners. California Proposition 65 warnings apply to chemicals present in the product materials.

Highlights

  • 20-piece set includes 10 couplers and 10 plugs for immediate multi-tool readiness
  • Brass couplers with knurled grip slide smoothly even with oily hands or gloves
  • Zinc-plated steel plugs resist rust and corrosion for long service life
  • High-flow design with wider inner diameter delivers more air to pneumatic tools
  • 1/4-inch NPT threads and Milton M-type compatibility fit existing shop airlines

Specifications

BrandSTEELMAN

Questions about this item

Does the brass coupler run hot or draw extra power when left connected all day?

These are passive brass fittings with no electrical parts, so they generate no heat and consume no power during continuous use.

What thread size must my air hose or tool already have to fit the 1/4 NPT ends?

Each coupler and plug has a 1/4-inch NPT female thread, so your hose or tool needs a matching 1/4-inch NPT male connection.

Will these Milton-compatible couplers work with the older M-type plugs I already own?

Yes, the set is designed to be compatible with Milton or M-type fittings, letting you mix the new couplers and plugs with existing M-type hardware.

Also in this aisle

People compared these

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