Plug 1/4"

The 1/4" brass plug without a flange is a closing component used in pumps and hydraulic subassemblies of pressure washers to blank off a service opening or a technical channel. Brass is typical for water-exposed parts, and the “without flange” version matters for correct seating in a specific port and the sealing method used there.

MPN / reference: 13387
Size: 1/4"
Material/version: brass, without flange

APPLICATION

The plug is used in service and assembly situations such as:

• closing a port/opening in the pump body after removing a service component,
• replacing a damaged plug after prior intervention in the pump,
• eliminating leaks caused by wear/damage of the closing element,
• restoring the factory closure of a channel in the hydraulic system.

SYMPTOMS - WHEN IT’S WORTH REPLACING

Replacement makes sense when typical signs appear:

• water seepage at the plug or “sweating” marks on the pump body,
• damaged thread (galling/stripping, tightening problems),
• deformation from using the wrong tool,
• leak returning despite retightening,
• visible pitting/material loss on sealing/contact surfaces after removal.

HOW TO CHOOSE THE RIGHT PART

Selection should be based on identifiable parameters:

• confirm 1/4" size and match to the pump port,
• verify the manufacturer number: MPN 13387,
• confirm you need the no-flange version (geometry and seating depth),
• compare with the removed plug: length, shape, and sealing method at that point.

With closing elements, a “similar-looking plug” can be a trap-small geometry differences can change clamping and tightness.

COMPATIBILITY

Select the plug by MPN 13387 and compatibility with the 1/4" port in the specific pump body. The “without flange” detail is important, because other shapes exist that may seal differently or not match seating depth.

[faq]

What does “without flange” change in practice?|A flange (when present) changes how the plug seats against the port and can act as a clamping/sealing surface. The no-flange version must match the specific port geometry-so don’t guess substitutes.

Does a leak at the plug always mean the plug must be replaced?|Not always. Sometimes the port seat is damaged, the contact surface is dirty, or the body thread is the issue. Replace the plug when it shows wear or you can’t achieve stable tightness.

What are common mistakes when installing 1/4" plugs in a pump?|Most often: starting the thread at an angle (damages threads), using excessive force, and assembling on a dirty seat. These lead to micro-leaks that return quickly.

Can a brass plug be “saved” if the hex/head is slightly damaged?|If the damage doesn’t affect the thread or sealing surfaces, sometimes yes. But if it’s deformed or can’t be tightened straight, replacement is the safer option.

What should I check after replacing the plug?|After the first pressure test, inspect for any “sweating,” and check that the plug hasn’t loosened after a few operating cycles. If leaking returns, inspect the body thread and the port seat.

[/faq]