Description
The 3/8″ × 3/8″ × 1/4″ Reducing Tee (John Guest) is a compact, easy-to-install push-fit plumbing fitting that connects three lines, with two 3/8″ outlets and one 1/4″ branch. Part of the trusted John Guest push-to-connect product family, this reducing tee makes plumbing connections fast and reliable without tools, glue, or soldering — perfect for water softeners, reverse osmosis systems, beverage lines, and filtration setups.
Key Features
- Push-Fit Quick-Connect Design — Tool-free installation: simply push tubing into the fitting for a secure connection.
- Reducing Tee Configuration — Two 3/8″ ports and one 1/4″ port for branching to smaller lines.
- John Guest Quality — Engineered polymer construction with stainless-steel grab rings and EPDM O-rings for a leak-resistant, durable seal.
- Reusable & Service-Friendly — Easily removable with a John Guest release tool for maintenance or reconfiguration.
- Corrosion-Resistant & Lead-Free — Safe for potable water and resistant to corrosion over time.
Compatibility
This 3/8″ × 3/8″ × 1/4″ Reducing Tee fits:
- 3/8″ OD and 1/4″ OD tubing (copper, PEX, CPVC, PE-RT, and HDPE with insert where applicable)
- Water softener plumbing (e.g., drain lines, bypass branches)
- Reverse osmosis systems (feed or product line branching)
- Filtration systems and manifolds
- Refrigerator/ice maker lines and other potable water applications
⚠️ Always verify tubing OD and type before installation.
Specifications
Fitting Type – Reducing tee (push-fit)
Ports – 3/8″, 3/8″, 1/4″
Connection Style – John Guest quick-connect
Material – Lead-free engineered polymer
Sealing – Stainless-steel grab ring + EPDM O-rings
Installation – Tool-free push-in (disconnect with release tool)
Applications
- Water softener line connections — branch supply to valves or bypass loops
- Reverse osmosis systems — feed split or sampling branch
- Filtration manifolds — distribute lines to carbon, sediment, or specialty cartridges
- Under-sink plumbing — connect accessory lines like permeate, drain, or faucet feeds
- Appliance lines — connect refrigerator or ice maker supplies
The reducing port lets you feed smaller components or accessories off a main line without additional adapters.
Benefits
✔ Quick tool-free installation
✔ Re-usable and serviceable
✔ Secure leak-resistant seal
✔ Works with multiple pipe materials
✔ Versatile for many plumbing and water filtration uses
Installation Tips
- Cut Tubing Squarely — Use a proper tube cutter for a clean, straight edge.
- Inspect O-Rings — Make sure the tubing and O-rings are clean and debris-free.
- Push Firmly — Insert tubing until it seats fully against the internal stop.
- Disconnect When Needed — Use a John Guest release tool to remove tubing for service.
The 3/8″ × 3/8″ × 1/4″ Reducing Tee (John Guest) is a versatile, reliable fitting that simplifies complex plumbing branch connections — ideal for water softener, RO, and filtration system installations where flexible, tool-free connections are preferred.
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