Frost Free Hydrant
- Brand matters. Reports of life from 1-5 years for really crappy ones, others are more like decades of life 
- OSE experience - galvanized pipe corrodes over 9 years - see bottom of hydrant all corroded in album . In album picture, brass seems to eat galvanized through electrolytic action - 
- Note some soils can be very corrosive 
- PVC and plastic lasts indefinitely 
- Galvanized pipes last between 20-50 years 
- The ultimate solution is the Pitless Adapter in terms of replacement. Slide-in connection, no dig required. Saves huge costs of excavation-replacement
OSE Campus Policy Recommendation
Frost free hydrants should be used strategically. In large open areas where stock watering is required - absolutely. But nowhere else. Expect maintenance of valves, and replament every decade or two. This is especially challenging if other lines such as electrical or internet complicate routing. Conclusion: do not use freeze-proof hydrants unless absolutely necessary. Absolutely necessary means ONLY daily supply in freezing weather. Not summer watering/pools/filling. Those should be in non-frost areas, or rolled up in winter. Long supply line is cheap ($100 for 1000 feet ).
Furthermore, when installing freeze-proof hydrants - use a Pitless Adapter for easy replacement.
- 1-1/4" - $40 
- 1-1/4" reducer to 3/4" - 
- Hydrant - . Note max 80 PSI, so this can't be used on house supply side unless pressure reduction is achieved upstream. This is not readily done without a 'water pit' or water supply house earlier on in the system.
- Hydrant repair kit -