Spa Hose FAQs: Size Guide & Troubleshooting
Hot Tub Plumbing Standards
How to Measure Hot Tub Pipes?

OD you measure | Closest NPS size | DN size |
~34.9 mm / 1.375" | 1 inch | DN 25 |
~41.1 mm / 1.625" | 1¼ inch | DN 32 |
~47.8 mm / 1.875" | 1½ inch | DN 40 |
~59.6 mm / 2.375" | 2 inch | DN 50 |
~73.0 mm / 2.875" | 2½ inch | DN 65 |
Schedule 40 vs Schedule 80
How to Identify Your Hose (for Right Replacement)?

How to Fix a Leaking Hot Tub Hose?
How to Clear a Blocked Hose?

Q&A – Common Hot Tub Hose Questions
Final Words from Hydrorelax
