John Guest Quick Connect Inline Shut-Off Valve - 3/8in QC

Tool-Free Flow Control for RO & Hydroponic Water Systems

The John Guest 3/8in Quick Connect Inline Shut-Off Valve gives you instant, tool-free flow control anywhere in your water purification or hydroponic irrigation line. A simple quarter-turn ball valve snaps into 3/8in quick connect (QC) tubing without fittings, clamps, or thread tape — making it easy to isolate sections of your system for maintenance, filter changes, or reconfiguration. Sourced by Hydro-logic for use with their reverse osmosis and purification platforms.

Key Features & Benefits

• Quick connect installation — pushes directly onto 3/8in QC tubing; no tools, thread sealant, or additional fittings required.
• Ball valve design — quarter-turn operation delivers positive on/off shutoff with minimal effort and reliable leak-free sealing.
• Inline configuration — mounts anywhere along a water line to isolate components, divert flow, or simplify system servicing.
• Hydroponic-grade materials — compatible with RO permeate and feed water lines used in indoor growing and water purification applications.
• Compact form factor — low-profile body fits in tight equipment bays, filter housings, and under-bench plumbing runs.

Who Should Use This

Home and commercial growers running Hydro-logic RO systems, or any hydroponic operator who wants simple shutoff capability at key points in a 3/8in quick connect water line.

Compatibility

Designed for 3/8in quick connect (QC) tubing. Compatible with Hydro-logic Stealth-RO, Evolution-RO, and similar systems using 3/8in QC fittings throughout the system plumbing.

Frequently Asked Questions

Do I need any tools or thread tape to install this valve?

No — it pushes directly onto 3/8in QC tubing. No tools, thread tape, or additional fittings are required.

Can I use this valve with non-Hydro-logic systems?

Yes, as long as your tubing uses 3/8in quick connect fittings, this valve will function correctly regardless of the system brand.

Is this valve suitable for use with filtered or RO water?

Yes — it is designed for use in water purification lines, including RO permeate and pre-filter feed water.

How do I know if the valve is open or closed?

The ball valve handle aligns with the flow direction when open and sits perpendicular to the line when closed, providing a clear visual indicator.