Male-to-Male Thread Adapters: 1/4" to 1"

Ten male-to-male reducer adapters for G (BSPP, ISO 228) pipe threads, covering every combination from G 1/4" to G 1". Typical uses are garden hoses, taps, pumps and rain barrels. Please don’t scale the parts: the threads follow ISO 228 and are printed 0.2 mm under nominal diameter, so they fit standard female fittings. These adapters are not compatible with NPT threads. Have fun! Adapters Group Adapter Wrench size Height Bore

G 1/4" G 3/8" → G 1/4" 22 mm 39.2 mm 6.0 mm

G 1/2" → G 1/4" 27 mm 42.7 mm 6.0 mm

G 3/4" → G 1/4" 32 mm 44.9 mm 6.0 mm

G 1" → G 1/4" 41 mm 51.7 mm 6.0 mm

G 3/8" G 1/2" → G 3/8" 27 mm 43.7 mm 9.5 mm

G 3/4" → G 3/8" 32 mm 45.9 mm 9.5 mm

G 1" → G 3/8" 41 mm 52.7 mm 9.5 mm

G 1/2" G 3/4" → G 1/2" 32 mm 48.3 mm 13.0 mm

G 1" → G 1/2" 41 mm 55.2 mm 13.0 mm

G 3/4" G 1" → G 3/4" 41 mm 57.2 mm 18.5 mm

Recommended Material Part Material

Adapter PETG, ASA , ABS

Print Settings Setting Value

Layer height 0.15 mm

Perimeters 4

Top / bottom layers 5

Supports None

Infill 40% or more

Print Orientation Part Orientation on the bed

Adapter Upright, large thread down

Use - Place a flat washer in each female fitting.

- Screw the large thread into its fitting by hand until the washer seals.

- Screw the small fitting onto the small thread the same way.

- If needed, tighten gently with a wrench on the hex. Don’t use thread tape on the end faces; these adapters seal against the washer, not in the thread.

Safety note: Printed adapters are meant for low-pressure water such as garden hoses, rain barrels and pumps. Don’t use them for gas, hot water, drinking-water installations or permanent mains pressure.