Sawyer ProductsSP150 Coupling for Water Filtration Cleaning, Blue, 1 x 1 x 1 inches

The Sawyer Coupler has truly become a reliable companion for my outdoor adventures. As an engineer, I'm accustomed to precision and efficiency, and this tool aligns perfectly with those principles. Its seamless attachment of a water bottle to my Sawyer water filter has saved me time and effort in maintaining the filter's performance while I'm out in the field.Interestingly, this little gadget has an unexpected dual nature. When leisure time beckons at the campsite, the same coupler transforms into a source of amusement. The mesmerizing tornado-like swirls it creates in a water bottle provide a strangely satisfying way to unwind and appreciate the elegance of physics in action.Yet, the Sawyer Coupler has even more surprises up its sleeve. In a pinch, it serves as an ingenious makeshift neckerchief woggle. This multifunctional aspect is a testament to its well-thought-out design, proving its worth beyond just water filtration.Adding to its charm, the coupler's beautiful blue color brings a touch of fashion to the wilderness. As I navigate the trails, its vibrant hue stands out, not just for its functionality, but also for its style. In the realm of outdoor gear, finding a tool that combines utility with a touch of personal flair is a rarity, and the Sawyer Coupler accomplishes this brilliantly.From practical functionality to unexpected entertainment and even a hint of fashion, the Sawyer Coupler has seamlessly woven itself into my outdoor experiences. It's become an essential item in my backpack, embodying the essence of innovation, versatility, and a dash of personality.

A MUST HAVE for the larger Sawyer filter (mini filter has NO output threads).As others have said, it allows automatic, hands off GRAVITY feed into collapsible plastic containers and they automatically shut-off when used right.MUCH better for back-flushing.CLEANING - BEST FOR ME . . . . I got rid of the syringe on this product and carry this much smaller, more effective Sawyer SP150 Cleaning Coupler.I mostly use it for filling 1 quart, collapseable, screw-top, plastic bottles. When they get full the flow automatically stops since it is sealed tight (air is removed before filling). Cleaning, then, is as easy as squeezing the clean bag after removing the dirty bag. It's SO easy, my filter gets back-flushed every use and it performs great, seemingly, forever.Hard plastic bottles with the same screw top have their advantage in camping and can also be used BUT MUST be coupled loosly to allow air to escape. After filling, tighten the clean bottle, remove the dirty source, squeeze the clean bottle to back-flush. Top off the clean bottle if desired.GRAVITY AUTO FILTERINGWith the Cleaning Coupler (SP150) and the Inline Adapters (SP110) and with some clear plastic hoses, I connected the filter to a Reliance 2.5 gallon collapseable plastic jug (wt 7.5 oz) !!Now with just one trip to the stream I have 2 1/2 gallons of drinking water available (after filtering) and the wide mouth of the "dirty" jug fills quickly.3 or 4 ft of hose also allows a higher elevation for the "dirty" source and increases the flow considerably.As a bonus, the drinking valve that comes with the filter fit perfectly into the mouth of a second 2 1/2 gallon jug so I could get a full load of clean water with no work and no need to hang around and watch it. Water flow automatically stops when the "clean" jug is full since it fit so good.Same with screw-top collapsible bottles - screw one on to the filter with this Coupler, turn on the valve on the 2 1/2 gal jug and walk away - it stops automatically when full. I can fill my 4 x 1 Liter bags with less than 1 minute taken away from my outdoor fun !!

Works well and very light weight. Every ounce or gram matters when backpacking. Highly recommend.

I bought this to pair it with my CNOC Vecto from the Sawyer Squeeze.

What Sawyer does not include this adapter with their Sawyer Squeeze filter is beyond me. I use my Sawyer to fill collapsible silicon CNOC water bottles. This piece of expensive, but necessary plastic allows me to connect the Sawyer to the water bottles for filling. I do wish that this had a vent allowing the air inside the bottle to escape as it filled with water.

Great coupling with multiple uses. Does exactly what it should.I can make a gravity filter with this or just screw two smart water bottles together. Also fits the cnoc bag. Great item.

This totally cut down on my weight for the backcountry. It allows you to leave the syringe behind and use your bottle as the back flush. Also, fun fact if you string some paracord through one of your sawyer bags, connect the filter to that bag, and then use this connector to connect your smart water bottle to it you have a UL gravity filter. This set up has become my go-to for all my backpacking trips.A tip though, unscrew the smart water bottle about 1/8-1/4 turn from the coupler. This allows the air in the bottle to escape so the gravity system can work.

My buddy swears by this product!!