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Lincoln G300 straight grease gun coupler, steel body with knurled grip, 1/8 NPT thread

Lincoln

Lincoln G300 Grease Gun Coupler Straight 1/8 NPT

SKU CH-XT8P-R0MG9

Connects hand-operated grease guns to 1/8 NPT fittings with a 19/32 in. diameter steel body rated for 3000 psi working pressure and 8000 psi burst pressure

  • Product colorTransparent
  • 19/32 in. diameter reaches recessed fittings easily
  • 1/8 in. MNPT connects straight to hand-operated grease guns
  • 3,000 psi working pressure handles high-force lubrication jobs
  • 8,000 psi minimum burst pressure provides a strong safety margin
  • Knurled body and mill flats give secure grip during use

Lincoln G300 Grease Gun Coupler

The Lincoln G300 is a straight hydraulic grease gun coupler designed for hand-operated guns. It fits 1/8 inch MNPT connections and works with standard hydraulic-type grease fittings. Mechanics and maintenance technicians use it to reach lubrication points on automotive and industrial equipment.

Knurled body and mill flats improve grip

The knurled body and mill flats provide secure handling during attachment and removal. A small outside diameter of 19/32 inch allows access to recessed fittings. The built-in ball check prevents lubricant backup and leaks while maintaining a working pressure of 3000 psi.

Thread the coupler onto the gun outlet

Installation requires threading the 1/8 NPT connection onto the grease gun outlet. The straight design simplifies alignment with fittings. Over-tightening can damage threads, and worn fittings may prevent the ball check from sealing at the rated 8000 psi burst pressure.

How it compares

Measured against everything we stock in Drain Stoppers, Strainers & Traps, at today’s prices. Recalculated every night.

Price $4.99
Cheaper than about 93% of the 4,240 comparable items (median $31.99).

Specifications

Product
Brand nameLINCOLN INDUSTRIAL
Product colorTransparent

Questions about this item

Will the built-in ball check valve eventually need replacement on the Lincoln G300?

The ball check is integral to the coupler body and is not designed as a user-serviceable part; if it fails the entire coupler is replaced.

What pressure limit is reached first during continuous greasing with the 1/8 NPT coupler?

Working pressure is 3000 psi and the coupler is rated to a minimum burst pressure of 8000 psi.

Does the steel body get hot or transmit vibration when the gun runs all day?

The coupler has no moving parts that generate heat or vibration; it simply transmits grease at up to 3000 psi.

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