1/2" NPS to 3/4" GHT Pipe Adapter

1/2" NPS to 3/4" GHT Pipe Adapter — Irrigation to Garden Hose

This adapter connects a 1/2-14 NPS (National Pipe Straight) female threaded fitting to a 3/4" GHT (Garden Hose Thread) male or female connection, making it ideal for adapting standard irrigation system fittings to garden hose accessories, automatic pet waterers, or similar low-pressure water applications.

Designed as a direct replacement for a cracked factory fitting, this part bridges the gap between the 1/2" straight pipe thread world and the garden hose thread world — two standards that are frustratingly close in size but completely incompatible.

Thread specs:

• One end: 1/2-14 NPS female (straight thread, not tapered NPT)

• Other end: 3/4" GHT female (standard garden hose thread)

• Hex grip body: 40mm across flats for wrench tightening

Print Settings

Print with the 1/2" NPS end face-down on the build plate.

• Brim: Yes — recommended for adhesion around the NPS boss

• Supports: Yes — needed to support the hex body and GHT bore during the print

• Orientation benefit: Printing this way leaves the GHT end facing up, which means the bottom of the GHT bore (the washer seat) prints as a clean, flat surface against the build plate — no supports needed there and a better sealing surface for your washer

• Material: PETG recommended for any functional/wet environment use; PLA fine for test prints

• Layer height: 0.2mm or finer

• Perimeters/walls: At least 4 for thread strength

• Infill: 40%+ recommended

A standard 3/4" garden hose rubber washer seats in the GHT end. No sealant should be needed on the NPS straight thread side if mated to a properly toleranced fitting, though a wrap of PTFE tape never hurts.