Delrin Sleeve, 3/8

The 3/8-inch Delrin sleeve from Midland Metal is a compression ferrule designed to seal plastic and soft tubing in compression-style fittings. Molded from Delrin, a durable, low-friction acetal engineering plastic, this sleeve grips tubing firmly to create a leak-resistant joint without damaging or scoring the tube wall, which makes it especially well suited to water treatment and small-line plumbing where soft tubing is common.

As the compression nut is tightened onto the fitting body, the Delrin sleeve is pressed against the tubing, and that controlled compression forms the seal that keeps water contained. Choosing the correct 3/8-inch sleeve is important for a clean, dependable connection, and fitting a fresh ferrule whenever you remake a joint helps you avoid the leaks that commonly result from reusing a worn, set, or deformed part.

• Brand: Midland Metal Mfg
• Fitting type: compression sleeve (ferrule)
• Material: Delrin (acetal plastic)
• Size: 3/8 inch
• Secure, tube-friendly sealing for plastic lines
• Item weight: 0.01 lbs

Delrin is particularly appropriate for plastic and poly tubing because it provides ample holding force to resist the tube backing out under pressure while remaining gentle enough not to crush the tube wall the way a metal ferrule might. That balance keeps connections both secure and serviceable over time.

This sleeve pairs with a matching 3/8-inch compression nut and a compatible fitting body to complete a reliable tubing connection, and for soft tubing it is good practice to add a tube support insert that keeps the tube round under compression. Installers working with 3/8-inch poly tubing on filters, reverse osmosis systems, and accessory lines will find these inexpensive ferrules indispensable. Keep a supply on hand so every connection seals cleanly and confidently the first time. For 3/8-inch lines that see frequent service or relocation, having spare ferrules on hand means you can confidently remake a joint each time instead of gambling on a reused part that may no longer seal cleanly. A clean, square cut on the tubing and a quick deburr help the Delrin sleeve seat evenly, so spending a moment on tube preparation before assembly is one of the easiest ways to guarantee a connection that holds the first time. Keeping a supply of the right size on hand makes that good practice effortless.