Water Pump Hose Adapter – 3/8" ID to 20x1.5mm Thread

Got a water pump that won't play nice with your hose? If you're running a hydroponic setup, aquarium sump, or small irrigation loop and keep hitting a dead end trying to connect a 3/8" ID hose to a standard threaded pump outlet — this adapter is the exact piece you've been hunting for.

It threads directly onto a 20x1.5mm metric pump fitting and gives you a clean, secure barb connection for 3/8" inner diameter hose. No hose clamp gymnastics, no makeshift solutions with wrong-sized fittings wrapped in PTFE tape. Just a snug mechanical connection that holds.

How it solves the problem

The 20x1.5mm metric thread is common across a wide range of submersible pumps, circulation pumps, and hydroponic reservoir pumps — but the matching hose adapters are surprisingly hard to find off the shelf in the right size. This one is purpose-built for 3/8" ID hose, which is one of the most widely used tubing sizes in small-scale water systems.

• Fits 3/8" ID flexible tubing (push-on barb connection)
• 20x1.5mm metric male thread — compatible with most standard pump outlets
• Tight thread tolerance for a reliable seal with thread tape
• Compact profile — works in tight pump housings and reservoir lids
• Suitable for hydroponics, aquariums, fountain pumps, and small irrigation setups

Where it shines

This adapter earns its place in hydroponics grow rooms, aquarium filter setups, balcony drip irrigation systems, and anywhere a small water pump needs to push flow through 3/8" tubing. It's also a practical spare to keep on hand — because when a fitting fails mid-grow cycle, waiting a week for a hardware store order isn't an option.

Wrap the threads with a couple of layers of PTFE tape before installation for a watertight seal. Hand-tight plus a quarter turn is all you need.

Specifications

Design by robthewinner