Swimables | SW-41-178 | MasterTemp / Max‑E‑Therm Style Drain Plug with O‑Ring – Leak‑Resistant Maintenance Kit

Swimables SW‑41‑178 drain plug with O‑ring for Pentair MasterTemp and Sta‑Rite Max‑E‑Therm heaters. Ensures secure sealing, prevents leaks during draining and winterizing—easy DIY replacement for pool heating systems.

Key Features:

• OEM-compatible design: Perfect match for Pentair MasterTemp, ETI 400, and Sta‑Rite Max‑E‑Therm heaters 

• Enhanced sealing: Includes durable elastomer O‑ring to prevent water leaks during drain or service cycles

• Robust construction: Made from high-strength materials suited for pool heater environments 

• DIY-friendly installation: Threaded plug allows easy hand-tight or wrench assistance removal and re-installation

• Cost-effective maintenance: Inexpensive part ensures heater integrity and avoids water damage without professional service costs 

Product Overview:
The Swimables SW‑41‑178 Drain Plug with O‑Ring is a vital maintenance component for Pentair MasterTemp, ETI 400, and Sta‑Rite Max‑E‑Therm pool and spa heaters. Designed to securely seal the heater’s drain port, this plug prevents leaks during draining, winterizing, or routine service.

Built with durable materials, it withstands regular use and exposure to pool chemicals, ensuring long-term reliability. The included O‑ring provides a tight seal, and its threaded plug enables easy installation and removal—no specialized tools necessary. Ideal for do-it-yourself maintenance, this part allows pool owners to confidently manage seasonal draining or repairs without risking water loss or heater damage.

Compact and cost-effective, the SW‑41‑178 is recommended as part of regular heater upkeep or whenever the original drain plug is compromised. Including it in your maintenance kit helps maintain heater efficiency and prevents potential issues, making it a smart preventative investment.