Do you have to use the blue lick clip? And what is the difference between the white and pink straight one?

The blue ring is to prevent the plunger sleeve from being accidentally pushed in which could disconnect the tubing. I recommend you always use it on every fitting. The white straight connector is to connect 2 tubes together. You can use it in either direction. No difference. The pink one has an arrow molded on it (you will see it if you magnify and look close enough at the picture). It has a check valve and will allow water flow in one direction only - In the direction of the arrow. This prevents water from flowing back (commonly referred to as backflow). Hope this helps.

Is one of these fittings a check valve?

The pink ones only are check valves. The other straight ones are straight thru connectors.

What is the psi rating on these? planning to use for a misting system in the garden

Good question Robert. These fittings are rated for use with a water filtration system which is under pressure and could reach 100 psi. If you are planning on using them for a misting system, it would be considered an open flow system with very low pressure. I think that you can rest assured that these fitting are plenty strong for your need. I am an engineer and would certainly not hesitate for one second about using them and still getting a worry free good night sleep. You are safe. If you really want to know the pressure ratings on them, you will have to ask the manufacturer. Good luck.

what is the working psi ? need 120psi min

From my research similar fittings are 150psi at 70 degrees F. and 60 psi at 140 degrees F.

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💧 Connect Fast, Filter Smart — Stay Hydrated, Stay Ahead!

PRECISION FIT - Engineered for 1/4-inch OD tubing, ensuring leak-proof, secure connections every time.
BULK PACK ADVANTAGE - 30 connectors in one pack to future-proof your water filtration setup or share with your network.
DURABLE LIGHTWEIGHT - High-quality plastic construction that’s both sturdy and featherlight for easy handling.
EFFORTLESS INSTALLATION - Push-to-connect design means zero tools, zero hassle—get your RO system running in seconds.
UNIVERSAL COMPATIBILITY - Standardized for 6mm water filter tubing, making it the go-to choice for most RO systems.

The Lemoy 14'' OD Quick Connect Hose Pipe Connectors come in a convenient 30-piece pack, designed for seamless push-fit installation with 1/4-inch outer diameter tubing. Perfectly suited for reverse osmosis water filtration systems, these durable plastic fittings require no tools, ensuring quick, reliable, and leak-proof connections every time.

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Manufacturer	Lemoy
Package Dimensions	15.49 x 11.68 x 3.78 cm; 0.28 g
Size	1/4 Inch
Colour	Blue, White
Material	Plastic
Item Package Quantity	1
Number of Pieces	30
Measurement System	metric
Batteries included?	No
Batteries Required?	No
Item Weight	0.28 g

Lemoy 14'' OD Quick Connect Push in to Connect Hose Pipe Connectors Water Tube Fitting for RO Reverse Osmosis Water Filter Fittings Pack of 30

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