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
Four brass NPT connectors with 3/8 inch male threads

Loc-Line

Loc-Line 51804 3/8 In NPT Connector Pack of 4

SKU CH-2S18-5BG5E MPN 51804

Four 3/8 inch NPT male connectors rated to 60 psi for building flexible coolant or fluid lines

  • TypeDrain Components
  • Withstands up to 60 psi operating pressure
  • Connects directly to 3/8 inch NPT male threads
  • Resists acetone, alcohol, gasoline and common solvents
  • Pack of four connectors for multiple installations
  • Loc-Line brand trusted for modular hose systems

Connector pack for 3/8 NPT systems

This Loc-Line 51804 pack contains four connectors designed for 3/8 inch NPT male threads. Each unit transitions from a non-threaded 1/2 inch diameter end to the threaded connection. The components suit plumbing and fluid-transfer tasks that require this specific thread interface.

Pressure and chemical limits

The maximum working pressure is 60 psi. The material resists a listed range of lubricants and chemicals including acetone, alcohol, dish detergents, ethyl, gasoline, grease, lacquer solvents, oils and sodium hydroxide. Compatibility with substances outside this list is not confirmed by the manufacturer.

Simple threaded installation

Installation involves threading the 3/8 inch NPT male end into a matching female port. The non-threaded 1/2 inch end accepts a push-fit or clamped hose. Leaks usually come from insufficient thread sealant or overtightening; the pack provides four units so a damaged piece can be swapped quickly.

Highlights

  • Withstands up to 60 psi operating pressure
  • Connects directly to 3/8 inch NPT male threads
  • Resists acetone, alcohol, gasoline and common solvents
  • Pack of four connectors for multiple installations
  • Loc-Line brand trusted for modular hose systems

Specifications

TypeDrain Components
BrandLoc-Line
Model51804

Questions about this item

Should I buy the pack of four or look for a single 3/8 NPT connector?

The pack of four gives you spare connectors for multiple drain points or future repairs without reordering.

What does the 60 psi maximum pressure rating mean for my plumbing system?

It limits use to low-pressure drain, vent or coolant return lines; do not install on pressurised supply or hydraulic circuits.

How does the 3/8 inch NPT male thread affect compatibility?

It mates with standard 3/8 inch NPT female ports; taper threads seal with tape or paste and cannot join metric or BSP fittings.

Also in this aisle

People compared these

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