Barrow THKN-3/8-B03 G1/4 Compression Fitting for 10x13mm (3/8 ID x 1/2 OD) Soft Tubing, Brass with O-Ring

Barrow THKN-3/8-B03 G1/4 Compression Fitting for 10x13mm (3/8 ID x 1/2 OD) Soft Tubing, Brass with O-Ring

TL;DR: The THKN-3/8-B03 is a G1/4 compression fitting sized for 10x13mm soft tubing, which is 3/8 inch ID and 1/2 inch OD. A rubber O-ring under the base thread seals the fitting against any standard G1/4 port. The outer collar threads down over the tubing onto the inner barb to clamp the tube wall...

Common Applications

The THKN-3/8-B03 is a G1/4 compression fitting sized for 10x13mm soft tubing, which is 3/8 inch ID and 1/2 inch OD. A rubber O-ring under the base thread seals the fitting against any standard G1/4 port. The outer collar threads down over the tubing onto the inner barb to clamp the tube wall against the barb ribs. Tubing must match the listed ID/OD pair; oversized OD will not fit through the collar and undersized OD will not seal. Available finishes per the Barrow catalog include black, silver, and gold variants under matching part-number suffixes.

Frequently Asked Questions

Q: What tubing size does the THKN-3/8-B03 fit?

A: 10x13mm soft tubing only, which is 3/8 inch ID by 1/2 inch OD. Tubing outside that pair will not seal.

Q: What ports is this fitting compatible with?

A: Any standard G1/4 inch water cooling port on blocks, pumps, reservoirs, radiators, or distribution plates.

Q: What material is the fitting?

A: Brass body with a rubber O-ring at the thread base. Finish varies by SKU suffix (black, silver, gold).

Q: How is the fitting tightened onto the tubing?

A: Slide the outer collar onto the tube, push the tube fully onto the inner barb, then thread the collar down until it bottoms out by hand.

Q: How many fittings come per order?

A: One fitting per unit ordered. A standard loop typically needs 8 to 10 fittings.