15370 Bock Plastic-Lined Nipple – 3/4" x 3" Water Heater Nipple
🔥 Product Overview
The Bock 15370 Plastic-Lined Nipple is an OEM water heater connection fitting designed to prevent galvanic corrosion and premature tank failure. Featuring a plastic internal liner, this nipple electrically isolates dissimilar metals, protecting steel tanks from rust and electrolysis damage while maintaining full flow capacity.
This fitting is commonly used on Bock residential and commercial water heaters at hot and cold water connections.
⚙️ Key Features & Benefits
✔ Plastic-lined interior prevents galvanic corrosion
✔ Extends water heater tank life
✔ OEM replacement for Bock water heaters
✔ Durable steel construction with internal dielectric lining
✔ Maintains full flow without restriction
✔ Easy threaded installation
📊 Specifications
| Specification | Details |
|---|
| Model |
15370 |
| Type |
Plastic-Lined / Dielectric Nipple |
| Thread Size |
3/4" NPT |
| Length |
3 in |
| Material |
Steel with plastic liner |
| Application |
Hot & cold water heater connections |
| Brand |
Bock |
🔁 Common Applications
• Bock residential water heaters
• Bock commercial water heaters
• Hot and cold water tank connections
• Replacement for corroded dielectric nipples
• New water heater installations
❓ Frequently Asked Questions
Q: Why use plastic-lined nipples?
They prevent galvanic corrosion caused by dissimilar metals, which extends tank life.
Q: Can this be used on non-Bock heaters?
Yes, as long as the thread size and length match your heater connection.
Q: Where is this installed?
Typically on the hot and cold water ports of the water heater tank.
🛒 Shopping Tips
🧭 Always match nipple length and thread size to your heater specifications
🔧 Replace when corrosion is visible to avoid leaks
💡 Recommended for copper-to-steel piping connections
