Reducing Tee, 3/8″ x 3/8″ x 1/4″ (John Guest)

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

1. Cut Tubing Squarely — Use a proper tube cutter for a clean, straight edge.
2. Inspect O-Rings — Make sure the tubing and O-rings are clean and debris-free.
3. Push Firmly — Insert tubing until it seats fully against the internal stop.
4. 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.