LockNLube LNL81300-M Pressure Return Valve (PRV) Milwaukee Cordless Grease Guns

The LockNLube LNL81300-M Pressure Return Valve (PRV) fixes a common cordless grease gun problem: pressure lock in the hose after a clogged or slow Zerk fitting. With a quick twist of the PRV knob, trapped grease flows from the hose back into the tube, dropping line pressure so you can release the coupler cleanly—no mess, no wrestling the hose, and no wasted grease. The PRV installs in minutes on Milwaukee® M18™ and M12™ cordless grease guns and RYOBI® ONE+ 18V models, and it’s designed to work best with the LockNLube® Grease Coupler. By relieving back pressure instead of forcing a connection, shops extend coupler life and avoid broken fittings.

For fleet, heavy equipment, and farm maintenance, the LNL81300-M keeps PM routes moving. When a fitting won’t take grease, vent the line, disconnect safely, and move on. Crews spend less time cleaning up and more time greasing bearings, pins, and bushings—all while returning unused grease to the tube instead of wiping it off the floor.

Disclaimer: Designed only for the listed grease gun models. Modifications void the LockNLube warranty and may affect your grease gun warranty.

LockNLube Pressure Return Valve Milwaukee Cordless Grease Guns At a Glance

• Eliminates pressure lock: Twist the knob to return grease from the hose to the tube.
• Clean disconnects: Drop line pressure for easy removal of the grease coupler.
• Saves grease & parts: Reduces waste and helps extend grease coupler life.
• Fast install: Fits Milwaukee® M18/M12 and RYOBI® ONE+ 18V cordless grease guns.
• Best with LockNLube® coupler: Optimized for use with jaw-type LockNLube® Grease Coupler.
• Field-proven solution: Addresses back pressure that can exceed 10,000 psi in clogged fittings.
• Simple operation: Twist to relieve; resume greasing when the fitting is cleared.
• Shop-safe: Less mess and fewer risky, forceful disconnects.

Markets

• Fleet & Truck Maintenance Keeps chassis and suspension PMs moving with fewer delays.
• Construction & Heavy Equipment Avoids messy blow-offs at stubborn pins and bushings.
• Agriculture Saves grease and time on tractors and implements during field service.
• Industrial & Manufacturing Supports preventive maintenance with clean, repeatable disconnects.
• Municipal & Public Works Standardizes cordless grease gun use across mixed fleets.
• Trade Schools & Training Demonstrates correct pressure relief technique on cordless tools.

Technicians in these environments often meet fittings that won’t accept grease. Cordless pumps build pressure instantly, which locks the line and turns removal into a struggle. The LNL81300-M solves it with a controlled return path—venting the hose and sending grease back into the cartridge. That means the grease coupler releases without prying, fittings are protected, and the workstation stays clean. For crews rotating between machines all day, the PRV is a small add-on that pays off in saved time, less waste, and more predictable cordless grease gun operation.

LockNLube LNL81300-M Pressure Return Valve (PRV) Milwaukee Cordless Grease Guns Features

• Pressure Return Function: Twist-to-vent design returns grease to the tube to relieve back pressure.
• Compatibility Matched: Engineered for Milwaukee® M18/M12 and RYOBI® ONE+ 18V grease guns.
• Coupler Friendly: Works best with the LockNLube® Grease Coupler; reduces wear on jaws and seals.
• Mess Reduction: Prevents blow-off and grease spray when disconnecting from clogged Zerks.
• Quick Installation: Mounts in minutes with basic hand tools.
• User Note: Couplers with an integrated check valve reduce PRV effectiveness.

LockNLube LNL81300-M Pressure Return Valve (PRV) Milwaukee Cordless Grease Guns Includes

• (1) LNL81300-M Pressure Return Valve assembly
• (1) Quick start/install guide

LockNLube LNL81300M Pressure Return Valve (PRV) Milwaukee Cordless Grease Guns Specifications

• Model: LNL81300-M
• Tool Type: Pressure return valve for cordless grease guns
• Function: Returns grease from hose to tube to relieve line pressure
• Best Pairing: LockNLube® Grease Coupler
• Compatibility: Milwaukee® M18™ & M12™; RYOBI® ONE+ 18V cordless grease guns
• Install Time: Minutes (model-specific)
• Use Limitation: Not intended for unlisted grease gun models; do not modify

Why Professionals Choose the LockNLube Pressure Return Valve (PRV) Milwaukee Cordless Grease Guns

Crews pick the LNL81300-M because it solves pressure lock on a Milwaukee M18 or M12 cordless grease gun without workarounds. When a clogged Zerk stalls the job, a quick twist returns grease to the tube, drops pressure, and lets the grease coupler come off cleanly. The valve cuts waste, protects fittings, and shortens cleanup—key wins on busy PM routes. For users searching for a pressure return valve for cordless grease guns, this model provides a simple, reliable way to manage back pressure and keep greasing predictable across trucks, heavy equipment, and farm machinery.

Disclaimer: Designed only for the listed grease gun models. Modifications void the LockNLube warranty and may affect your grease gun warranty.