HoseFitFinder / Every thread and fitting standard

1/4 inch drip tubing (1/4" (0.170" ID x 0.250" OD))

Where 1/4" (0.170" ID x 0.250" OD) is used, its real dimensions, and how to connect it.

1/4" (0.170" ID x 0.250" OD)Thread standard

Inner diameter0.170 inch (about 4.3 mm)

Outer diameter0.250 inch (about 6.4 mm)

Barb fits ID range0.140 to 0.170 inch

Fitting typepush-in barb held by the tube wall

Used on: US micro-drip distribution tubing carrying water to drippers and 1/4 inch dripline.

US 1/4 inch tubing runs 0.170 inch bore and 0.250 inch outside. Its barbs are cut for a 0.140 to 0.170 inch inner diameter, so they are a fraction larger than 4/7 mm European barbs. Buy the barb to match the tubing you already own, not by the nominal name.

Quick-connect click fittings from Hozelock, Gardena and Karcher are proprietary and do not interchange. They all sit on top of a standard thread underneath, so the reliable way to move between brands is to adapt at the threaded tap or hose-end fitting, then use each brand's own connector above it.

Connect this fitting

Connect to 4/7 mm micro drip tubingneeds an adapter Connect to 16 mm LDPE drip supply pipeneeds an adapter 4/7 mm micro drip tubingrelated fitting (4/7 mm (4 mm ID x 7 mm OD))13 mm LDPE drip supply piperelated fitting (13 mm (about 1/2" nominal))16 mm LDPE drip supply piperelated fitting (16 mm (0.63" OD))1/2 inch US drip tubingrelated fitting (1/2" US (0.700" OD))

Sources: 1/4in polyethylene drip tubing 0.170in ID x 0.250in OD spec, Drip Depot · 1/4in barbed drip fittings for 0.140-0.170in ID tubing, DIG Corp