Brass Tube Support, 3/8

This 3/8-inch brass tube support from Midland Metal is an internal insert that reinforces soft or thin-walled tubing inside a compression fitting, keeping the tube round so it seals properly and resists collapse. By bracing the tube wall from the inside, it helps the ferrule grip evenly all the way around and create a strong, leak-free connection that holds up under system pressure.

Soft poly and plastic tubing can deform or partially collapse when squeezed by a compression nut and sleeve, and a distorted tube wall leads to poor, uneven seals and potential leaks, or even a tube that pulls out under pressure. Sliding a brass tube support into the end of the tubing prevents this distortion by ensuring the fitting clamps down onto a fully supported, round tube. It is a simple, inexpensive component that dramatically improves the reliability of compression connections.

• Brand: Midland Metal Mfg
• Fitting type: tube support / insert
• Material: brass
• Size: 3/8 inch
• Prevents collapse of soft tubing in compression joints
• Item weight: 0.01 lbs

For anyone working with 3/8-inch poly tubing on water treatment systems, filters, and reverse osmosis equipment, tube supports are an essential partner to compression nuts and ferrules. They are easy to overlook right up until a connection leaks, so including them as standard practice saves both time and frustration on the job.

Using the support is straightforward: press it fully into the end of the tubing before assembling the compression nut and ferrule, then tighten the fitting to a firm, leak-free joint. Keeping a supply of these brass inserts on hand guarantees that every 3/8-inch tubing connection you make is secure, round, and built to last, whether you are commissioning a new system or repairing an existing one. Including a tube support as standard practice on every soft-tubing connection, rather than only when a leak appears, is the kind of preventive habit that quietly eliminates a whole category of callbacks. A clean, square-cut and deburred tube end paired with the support helps the ferrule grip evenly, so taking a moment to prepare the tubing properly turns a potentially leaky connection into a dependable one that holds under pressure for the long term.