10 Best Grease Gun Tips 2025 in the United States

The LockNLube Grease Gun Coupler is a highly practical tool designed to make greasing tasks easier and more efficient. Its standout feature is the locking mechanism that securely attaches to Zerk fittings, ensuring that grease is delivered precisely and not wasted on the machine's surface.

This feature allows users to utilize both hands on the grease gun, making the process more efficient and less messy. Another significant advantage is its rebuildable design, which includes a spare rebuild kit, effectively giving you two couplers for the price of one.

The coupler is compatible with all grease guns, whether battery-operated, pneumatic, or manual, thanks to its 1/8-inch thread. This makes it a long-lasting investment suitable for various grease gun types.

The LUMAX LX-1400-2 Silver Standard Grease Coupler is designed to fit all 1/8" NPT threads, making it a versatile choice if your grease gun uses this common thread size. With a maximum pressure rating of 4500 PSI (310 Bar), it can handle high-pressure applications suitable for most automotive and machinery lubrication needs. Its construction includes four hardened steel jaws, providing durability and a firm grip on grease fittings, while the spring-loaded ball check valve helps prevent leakage, resulting in less mess and more efficient greasing.

The coupler’s small outside diameter makes it easier to reach recessed fittings, which is handy in tight spaces. The knurled body and flats improve grip for easy installation and removal, even when working with greasy hands. Being a pack of two adds good value for those who regularly use or replace grease couplers.

One consideration is that the finish is painted rather than stainless steel or chrome-plated, so it might show wear or corrosion over long-term use in tough environments. Also, the product focuses on the standard 1/8" NPT size, so it may not be compatible if your grease gun or fittings require a different threading. This LUMAX pack provides a reliable and affordable option for durable, easy-to-use grease couplers that fit standard 1/8" NPT threads and handle strong pressure.