Quick Disconnect 3/8" Male Plug

304 Stainless Steel plug turns NPT-finished pressure wash hose into quick-disconnect units. Perfect for hoses that see regular coupling and uncoupling, reducing time and effort. The D10079 fitting features 3/8" male NPT threading, converting female-ended hose into 3/8" Q.D. plug. It's a General Pump OEM part, guaranteeing the quality you expect along with easy usage and installation.

Dimensions: 2 in x 1 in x 1 in

Specifications

• Port 1: 3/8" NPT male
• Port 2: 3/8" Q.D.
• Hex Size: 7/8"
• Standard Rate PSI: 5000
• Max PSI: 6000
• Max GPM: 12
• Max Temperature: 175 degrees F
• Material: 304 Stainless Steel

Use Cases:

• Pressure wash hoses
• Spray Gun Lines
• Hose reels
• Wand setups
• High-pressure connections
• Breweries
• Detailing shops

Pre-Purchase Compatibility Check

• System Pressure Check: Ensure your system operates at or below the maximum pressure rating (5,000 to 6,000 PSI, depending on the exact system configuration).
• Temperature Check: Confirm the system fluid temperature does not exceed 175°F (79°C).
• Port 1 (Threaded Connection): Verify the receiving connection is a 3/8" Female NPT (FNPT) thread.
• Port 2 (Quick Disconnect): Confirm your receiving coupler is a standard 3/8" Quick Connect (QC) Socket.
• Material Compatibility: Ensure 304 Stainless Steel is suitable for the chemicals/detergents passing through your system.

Installation Checklist

• Thread Sealant Ready: Have Teflon (PTFE) tape or a high-pressure liquid thread sealant (like Loctite 567) on hand to wrap the 3/8" Male NPT threads before installation.
• Correct Tools: Prepare an open-ended wrench or adjustable crescent wrench that fits the hex portion of the plug to avoid stripping the metal.
• Orientation Double-Check: Ensure you are mounting this plug correctly.

Operation Checklist

• Hand-Tighten First: Thread the plug into the female port by hand to ensure it isn't cross-threading, then tighten securely with a wrench.
• Secure Engagement: Pull back the collar on your female 3/8" QC coupler, insert the D10079 plug fully, and release the collar. Tug firmly to ensure a positive, locked connection.
• Leak Test: Run the system at low pressure initially to check for leaks around the NPT threads. If weeping occurs, tighten slightly or re-apply thread sealant.

Different Types of Quick Disconnects

Quick disconnects come in two main parts: a plug and a coupler. The plug is the male side that inserts into the coupler, while the coupler is the female side that locks the connection in place. Thread style also matters, since many pressure wash systems use NPT threads, while other setups may use barb ends or different connection types. A 3/8-inch quick connect fitting must match both the quick-disconnect body size and the thread or hose-end size to fit correctly.

Are All Quick Disconnects the Same Size?

No. Quick disconnects are not all the same size, and a 3/8-inch quick connect fitting does not fit every plug or coupler. The 3/8-inch size usually refers to the quick-disconnect body, while the thread size may be 3/8-inch NPT, 1/4-inch NPT, or another connection style. A plug and coupler must match in profile and body size, or they will not connect or seal correctly. This matters in pressure wash systems, since a wrong fit can restrict flow, cause leaks, or slow down service work. Before ordering, check the quick-connect size, the thread or barb size, and the pressure rating. Moreover, confirm the material, since stainless steel quick disconnect parts are often preferred where corrosion resistance and long service life matter.

How to Install

1. To install a 3/8-inch stainless steel quick disconnect plug, first shut off the system pressure and disconnect the hose or tool from the water supply.
2. Check that the fitting thread matches the port, since most pressure wash setups use 3/8-inch male NPT or 3/8-inch female NPT connections.
3. Apply the correct thread sealant or PTFE tape to the NPT threads, while keeping the first thread clear to help prevent debris from entering the line.
4. Thread the quick connect fitting in by hand to avoid cross-threading, and then tighten it with a wrench until it is secure.
5. Do not over tighten. Excess force can damage threads or affect the seal.
6. After installation, connect the plug and coupler, restore pressure slowly, and inspect for leaks before putting the line into regular service.

What Size O-Ring for 3/8" Quick Disconnect?

A 3/8-inch quick disconnect does not use one universal O-ring size. The correct O-ring depends on the plug and coupler profile, the manufacturer, and the seal design inside the coupler. Some 3/8-inch stainless steel quick connect parts seal on an internal O-ring, while others depend more on the thread seal at the NPT connection. While sizes can vary by brand, -012 size is the standard for many 3/8" pressure hose fittings. Ultimately however, the safest approach is to check the parts diagram, OEM specification, or replacement seal kit for that exact quick disconnect fitting. If the O-ring is worn, flattened, or cut, replace it with the same material and size to maintain a proper seal under pressure. Since pressure wash systems run at high PSI, using the wrong O-ring can cause leaks, poor coupling, or early part failure.

Disadvantages of Using Quick Disconnect

Quick disconnect fittings speed up hose changes, but they also add one more connection point that can wear, leak, or fail over time. A plug and coupler must stay clean and match the same body size and profile, otherwise the connection may not lock or seal correctly. Since these parts are opened and closed often, the internal O-ring and locking mechanism can wear faster than a fixed threaded connection. Quick disconnects can also create a small flow restriction, which may matter in high-pressure systems that need steady PSI and full water volume. Stainless steel quick disconnect parts help reduce corrosion issues; however, they still need routine inspection for seal wear, thread damage, and debris buildup.

Upkeep and Maintenance Tips

• Inspect the quick disconnect plug and coupler on a regular schedule for thread damage, worn locking grooves, and signs of leakage.
• Keep both connection ends clean, since grit and chemical residue can affect the seal and make coupling harder. If the fitting uses an internal O-ring, check it for cuts, flattening, or swelling, and replace it with the correct size and material when needed.
• After cleaning, apply a light lubricant that is safe for the seal material, while avoiding excess that can trap dirt.
• Confirm the stainless steel quick disconnect still locks firmly under pressure and does not separate during normal hose movement.
• If you see corrosion, galling, or repeated leaks, replace the quick connect fitting before it causes downtime in the wash bay.

WARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm (For more information go to www.p65warnings.ca.gov).