Yes, modern piston-type water hammer arrestors can be installed in any orientation—including upside down, sideways, or vertically—without affecting their performance. Unlike older air chamber standpipes that could become waterlogged over time, modern certified mechanical arrestors utilize a sealed internal piston and high-pressure O-ring or elastomeric bladder separating the water from a sealed air cushion. This mechanical design functions reliably regardless of gravitational orientation. Verification: Check the manufacturer installation manual for specific product certifications and confirm zero leaks post-installation.
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