Reddit reviews John Guest Speedfit PPSV040808WP Straight Shutoff Valve Plumbing Fitting, 1/4 x 1/4 Inch

What do you want to know?

I will give you 3 pointers if you buy this particular unit, though. I only bought this because it's the cheapest 4 stage you can get, and I know I don't need all the bells and whistles (in-line TDS, etc -except one that I will mention in part 2 below) that come with the ones that cost way more.

1. If you want to make serious quantities of water, and you don't have the patience of a saint, get THIS MEMBRANE and just keep the included 50gpd membrane as a spare. The dow filmtec membranes are the best you can get. They're the only ones that really produce anywhere close to their stated GPD rating. The 75GPD membrane is great too. Honestly it's just a more convenient, and longer lasting membrane either way. I've gone through a shitload of RO membranes. Whenever I need a replacement, the filmtec 75 is what I buy.
   
   
2. If you're installing it on a bathroom sink that has easily accessible male threading (after you remove the aerator), then get one of THESE. It's much easier to just divert the faucet water to your 1/4" tubing than having to detach and reattach the included plastic faucet adapter every time you want to make water. If you want to cut the faucet out of the picture altogether (my preferred method) then install a SADDLE VALVE straight to your 1/2" copper pipe (cold water pipe ONLY - never connect an RO/DI to hot water) and a SHUTOFF VALVE in-line between the pipe and your RO/DI's supply port. That's what I did today. Tapped into the copper pipe behind my bathroom sink; drilled a hole in the wall just above the sink and ran the tubing into the bathroom; installed shutoff valve there; drilled holes in undersink cabinet to accommodate supply, waste, and clean tubes; mounted the filter unit inside the undersink cabinet. Now I have a convenient on/off switch just above my bathroom sink. The tubing for waste and clean are coiled up between the cabinet and my tub. When I want to make water I just snake the waste line down my bathtub drain, pop my water sprayer in the tub and fill her up. No worries of spills/overflow. No hassle of connecting/disconnecting plastic fittings that are prone to thread strip.
   
   
3. Doesn't hurt to install a BACKFLUSH. This is the one 'bell and whistle' that I think is actually really useful. Especially if you have really hard water, It's good to flush heavy solids out of your membrane occasionally.

Personally, OP, I wouldn’t use a garden hose from outside. It would require you to leave it on all the time, and I don’t trust garden hoses to be on all day, let alone 24/7. Also, I don’t know about this particular maker, but a lot of higher end machines have liquid level boards and sensors so they know when and how much to refill automatically.

I would plumb from a sink indoors, so you don’t have to worry about freezing/bursting hoses and tubing during the cold months if you’re in certain climates. Tap into a sink with the following, if you plan to do it yourself (I usually urge people to hire professionals though):


http://www.hhdonline.com/pc_product_detail.asp?key=F58A52082DA6422091676E0C5554B675

(This hooks onto the shut-off for your sink—the compression nut goes onto the tube first, then the delrin sleeve [linked examples of all of those below] goes on the outside of your 1/4” JG tubing. The brass insert goes inside, then you screw it onto the tee. I would also add one of the plastic shut-off valves to your line under the sink before you run the rest of the line)

https://www.acehardware.com/departments/heating-and-cooling/air-conditioners-and-coolers/evaporative-cooler-parts-and-accessories/4518155

https://www.acehardware.com/departments/heating-and-cooling/air-conditioners-and-coolers/evaporative-cooler-parts-and-accessories/4265013


I would connect one of these under the sink and behind your espresso maker, but I’m overly cautious. I would also add a second shut-off for your water line right before the machine.

https://www.ebay.com/itm/Push-Fit-Quick-Connect-Water-Leak-Controller-3-8-3-8-Emergency-Shut-Off-RO-/273006090140

John Guest PPSV040808WP Single Straight Shut-Off Valve, 1/4" Tube OD x 1/4" https://www.amazon.com/dp/B003YKF2E2/ref=cm_sw_r_cp_api_i_xOOkDbE3T1Q0K

As a safety measure, I also like to use these, they clip behind the little protruding plastic pieces that go over the hose.

https://www.freshwatersystems.com/products/john-guest-locking-clip-1-4

As for that white fitting at the end of the blue line, I’m assuming that you’re supposed to put that on the machine, yes? Plastic fittings are fine, but these are an option if it ever strips, starts leaking, etc.:


https://www.freshwatersystems.com/products/john-guest-lead-free-brass-flare-female-connector-1-4-x-1-4-ffl


John Guest NC2098LF Female Garden Hose Connector, 1/4" OD x 3/4 (Pack of 10) https://www.amazon.com/dp/B00N4NJ1WI/ref=cm_sw_r_cp_api_i_ONOkDbNXJE6J2

As for any tips on John guest, I try not to bend in too many harsh angles—if you need are short on space, use an adapter with an elbow on it so the tubing doesn’t bend going into the machine. Bends and warps mean leak if you have to forcefully bend it to make the connection.

Again, worth it to see what a plumber costs and if they can do it, but I hope this helps!

John Guest valve

There are a ton of ways to do this. I just bought a system off of amazon, (ispring water RCC7). Super easy install. Comes with a valve that goes in between the faucet and the shutoff valve under the sink. No permenant modification needed. SHut off the water to the faucet, unscrew the tube going to the faucet, install the diverter valve, turn water back on.

Don't want a RO faucet on the counter? Get a 1/4" shutoff valve, 5 bucks on amazon. Don't wan to drill into the drain? Run the drain line up and just fix it to the edge of the sink with tape or putty or hot glue or something. It won't be super pretty, but it'll work great, and be completely removable and movable in about 20 min.

RO Unit: ~$190 USD https://smile.amazon.com/iSpring-RCC7-Certified-5-Stage-Drinking/dp/B003XELTTG/

shutoff valve (in lieu of a counter-mounted faucet) https://smile.amazon.com/John-Guest-PPSV040808WP-Straight-Shut-Off/dp/B003YKF2E2