{"product_id":"double-shut-off-steel-plug-1-2-fpt","title":"Double Shut-Off Steel Plug 1\/4\", 3\/8\" and 1\/2\" FPT","description":"\u003cp\u003e\u003cstrong\u003eThe Double Shut-Off Steel Plug is a zinc plated steel quick connect plug in 1\/4\", 3\/8\", and 1\/2\" FPT, rated from 4000 to 5000 PSI depending on size. Valves in both coupling halves seal the instant you disconnect, so nothing drips and the line stays charged. In stock and ships same day from Sun Brite Supply in Gaithersburg, Maryland.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch2\u003eProduct Overview\u003c\/h2\u003e\n\u003cp\u003eA standard quick connect dumps whatever is in the line the moment you pull it apart. A double shut-off plug does not. Spring loaded poppets sit inside both the plug and the socket, and each one snaps closed on disconnect. You get no spray, no puddle, and no lost prime.\u003c\/p\u003e\n\u003cp\u003eThat matters most when you are running more than one tool off a single supply. Wash bays, in-plant systems, multi-station trailers, and chemical lines all use double shut-off couplings for the same reason: you can break a connection mid job without shutting down the whole rig.\u003c\/p\u003e\n\u003cp\u003eThis plug is the male half of the coupling. It threads into your gun, whip, or manifold with FPT pipe thread, then snaps into a matching double shut-off socket. The body is machined steel with a zinc plated finish, which stands up to wet bays and outdoor trailer storage far better than bare steel.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features and Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDouble Shut-Off Design:\u003c\/strong\u003e spring loaded valves in both halves seal on disconnect, so there are no drips and no pressure loss\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e machined steel with a zinc plated finish for rust resistance\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSizes:\u003c\/strong\u003e 1\/4\" FPT, 3\/8\" FPT, and 1\/2\" FPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRated to 5000 PSI:\u003c\/strong\u003e the 1\/4\" carries the highest rating, see the size table below\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBall Locking Sleeve:\u003c\/strong\u003e positive mechanical lock that holds under pressure and vibration\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCaptive Seal:\u003c\/strong\u003e keeps the poppet sealed tight when the plug is disconnected and sitting loose\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMade in USA:\u003c\/strong\u003e per the manufacturer\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eType\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDouble shut-off quick connect plug (male half)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSizes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1\/4\", 3\/8\", 1\/2\" FPT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSteel, zinc plated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMax Temperature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e300 F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eThread\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFPT (female pipe thread)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOrigin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMade in USA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003ePressure Rating by Size\u003c\/h2\u003e\n\u003cp\u003eThese are not all rated the same, so match the number to the size you are buying.\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSize\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eItem Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eMax Pressure\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eMax Temp\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1\/4\" FPT\u003c\/td\u003e\n\u003ctd\u003e4099\u003c\/td\u003e\n\u003ctd\u003e5000 PSI\u003c\/td\u003e\n\u003ctd\u003e300 F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e3\/8\" FPT\u003c\/td\u003e\n\u003ctd\u003e4100\u003c\/td\u003e\n\u003ctd\u003e4500 PSI\u003c\/td\u003e\n\u003ctd\u003e300 F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1\/2\" FPT\u003c\/td\u003e\n\u003ctd\u003e4102\u003c\/td\u003e\n\u003ctd\u003e4000 PSI\u003c\/td\u003e\n\u003ctd\u003e300 F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eDouble shut-off couplings are a matched system. The plug and the socket both carry valves, and both have to be double shut-off style for the connection to seal on both sides. A double shut-off plug will physically connect to a standard straight-through socket, but you only get one side sealing, which defeats the purpose.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e1\/4\" FPT\u003c\/strong\u003e for gun inlets, small whips, chemical lines, and low flow accessories\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3\/8\" FPT\u003c\/strong\u003e for most gun and hose connections on professional machines\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1\/2\" FPT\u003c\/strong\u003e for main supply lines, manifolds, and high flow systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eMatch the size to the port you are threading into, not to the hose you think you need. A 3\/8\" plug will not thread into a 1\/4\" port no matter how much you lean on the wrench.\u003c\/p\u003e\n\n\u003ch2\u003eApplications and Use Cases\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMulti-station wash bays\u003c\/strong\u003e where several operators share one pressurized supply\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChemical and soap lines\u003c\/strong\u003e where a disconnect that sprays is a safety problem, not just a mess\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHot water rigs\u003c\/strong\u003e where dumping the line means losing heat as well as pressure\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTool changes mid job\u003c\/strong\u003e when switching between guns, surface cleaners, and extension wands\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTrailer and skid plumbing\u003c\/strong\u003e where a manifold feeds several outlets\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation and Maintenance\u003c\/h2\u003e\n\u003cp\u003eWrap the male pipe threads with PTFE tape or brush on pipe sealant before you thread the plug in. Snug it down with a wrench, but do not crank on it. Over-torquing a fitting into a cast port is how ports get cracked.\u003c\/p\u003e\n\u003cp\u003eWipe the face of the plug before every connect. Grit sitting on the poppet is the number one reason a shut-off fitting starts to weep, and it is a lot cheaper to wipe a fitting than to replace one. Keep a rag in the truck for this.\u003c\/p\u003e\n\u003cp\u003eIf a coupling gets hard to connect or will not release, do not force the sleeve. Dirt or light corrosion is binding the balls. Clean it with a wire brush, work a drop of silicone lubricant into the sleeve, and cycle it a few times.\u003c\/p\u003e\n\u003cp\u003eCheck the seal on the plug periodically. A weeping connection is usually a worn seal, not a worn body. If the sealing surfaces are scored or pitted, replace the plug rather than trying to dress the metal.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eWhat is the difference between a double shut-off plug and a regular quick connect plug?\u003c\/h3\u003e\n\u003cp\u003eA regular quick connect has no valve. Pull it apart under pressure and the line dumps. A double shut-off plug has a spring loaded valve inside, and so does its matching socket, so both sides seal at the moment of disconnect. Nothing sprays and nothing drains.\u003c\/p\u003e\n\u003ch3\u003eAre all three sizes rated the same?\u003c\/h3\u003e\n\u003cp\u003eNo. The 1\/4\" is rated to 5000 PSI, the 3\/8\" to 4500 PSI, and the 1\/2\" to 4000 PSI. All three are good to 300 F. See the table above.\u003c\/p\u003e\n\u003ch3\u003eCan I use a double shut-off plug with a standard socket?\u003c\/h3\u003e\n\u003cp\u003eIt will connect if the size and coupling standard match, but only the plug side will seal. To get the full benefit you want a double shut-off socket on the other half.\u003c\/p\u003e\n\u003ch3\u003eWhat size double shut-off plug do I need?\u003c\/h3\u003e\n\u003cp\u003eCheck the port you are threading into. Most professional gun and hose connections are 3\/8\" FPT. Smaller accessories and chemical lines usually run 1\/4\" FPT. Main supply lines and manifolds on higher flow systems run 1\/2\" FPT.\u003c\/p\u003e\n\u003ch3\u003eWhy is my double shut-off coupling leaking?\u003c\/h3\u003e\n\u003cp\u003eNine times out of ten it is debris on the poppet or a worn seal. Disconnect it, wipe both faces clean, and reconnect. If it still weeps, inspect the seal and the sealing surfaces for scoring.\u003c\/p\u003e\n\u003ch3\u003eWhere can I buy pressure washer quick connects near Gaithersburg, Maryland?\u003c\/h3\u003e\n\u003cp\u003eSun Brite Supply is located at 16620 Oakmont Ave, Gaithersburg, MD 20877. We carry a full selection of pressure washer quick connects for walk-in customers and ship nationwide. Local contractors in Maryland, Virginia, DC, and the Mid-Atlantic area can stop by for same-day pickup. If you are outside the area, order online at sunbritesupplymd.com and we will ship it out fast. Call us at 301-519-9274 if you need help finding the right part.\u003c\/p\u003e\n\n\u003ch2\u003eBefore You Order: What to Check\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePort size and thread type:\u003c\/strong\u003e measure the port you are threading into. FPT is female pipe thread, not a hose thread.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMatching half:\u003c\/strong\u003e confirm the socket on the other side is also double shut-off, and the same size.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure and temperature:\u003c\/strong\u003e check the size table above, the three sizes are not rated the same.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOld part comparison:\u003c\/strong\u003e if you can, back the old fitting out and compare it side by side with the specs listed here.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStill not sure?\u003c\/strong\u003e Call us before you order. Five minutes on the phone beats a return.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy Buy Your Quick Connects from Sun Brite Supply?\u003c\/h2\u003e\n\u003cp\u003eSun Brite Supply ships from our warehouse in Gaithersburg, Maryland. We stock the same parts the pros run, and every part we sell has been vetted by people who work on this equipment every day. No knockoffs, no mystery fittings that round off the first time you put a wrench on them.\u003c\/p\u003e\n\u003cp\u003eNeed help picking the right part? Call us at 301-519-9274. You will talk to someone who actually knows pressure washing equipment, not a script reader at a call center. Our team has over 50 years of combined experience in the pressure washing industry, and we can verify fitment, suggest alternatives, and get you the right part the first time.\u003c\/p\u003e\n\u003cp\u003eLocal to Maryland or the DMV area? Stop by our Gaithersburg location at 16620 Oakmont Ave for walk-in counter sales. We can pull parts, check fitment in person, and get you set up on the spot.\u003c\/p\u003e\n\u003cp\u003eWe carry over 2,700 pressure washing parts and accessories in stock. Pumps, hoses, fittings, nozzles, chemicals, engine parts, burner parts, and electrical controls. Most orders ship the same business day when placed before 2 PM Eastern, so whether you are in Virginia, Pennsylvania, DC, or across the country, you get your parts fast.\u003c\/p\u003e\n\u003cp\u003eShop online at sunbritesupplymd.com or call us directly at 301-519-9274. Over 2,700 parts ready to ship.\u003c\/p\u003e\n\n\u003cp\u003ePair this plug with a matching double shut-off socket and a length of pressure hose so both ends of the connection seal the same way.\u003c\/p\u003e\n\n\u003ch2\u003eRelated Parts \u0026amp; Equipment\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/collections\/quick-connects\"\u003eBrowse Quick Connects\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/collections\/fittings\"\u003eFittings \u0026amp; Adapters\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/collections\/pressure-washer-repair-parts\"\u003ePressure Washer Parts\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Sun Brite Supply","offers":[{"title":"1\/2\"","offer_id":45032539553992,"sku":"4102","price":15.84,"currency_code":"USD","in_stock":true},{"title":"1\/4\"","offer_id":45043491897544,"sku":"4099","price":10.07,"currency_code":"USD","in_stock":true},{"title":"3\/8\"","offer_id":45043491930312,"sku":"4100","price":12.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0517\/4827\/4376\/files\/Double-Shut-off-Steel-Plug-1-2.png?v=1787869871","url":"https:\/\/sunbritesupplymd.com\/products\/double-shut-off-steel-plug-1-2-fpt","provider":"Sun Brite Supply","version":"1.0","type":"link"}