1/2" NPS to 3/4" GHT Pipe Adapter
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I used this adapter to connect a standard garden hose thread to an automatic dog water bowl.
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Model information
- Source
- Printables
- Category
- Outdoor & Garden
- License
- Creative Commons — Attribution — Noncommercial
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.