Skip to content
Free Local Pickup Ship to Your Hometown Store
Pro & Contractor Accounts Apply for Net Terms
100,000+ Products Trusted American Hardware Brands

Reliance PEX Lined Electric or Gas Water Heater Nipples 3 in. H 3/4 in.

Reliance PEX Lined Electric or Gas Water Heater Nipples — 3 in. Long, 3/4 in. DiameterThese Reliance nipples are purpose-built to connect your water heater to PEX piping with relia…

Reliance MPN 100108858 In Stock & Ready to Ship
Local Price Check i Local stores may price this as low as $12.99. Our online price is $14.99.
$14.99
Includes free shipping on orders over $75 · $8.99 standard below
Delivery in as little as 1–4 business days Order within for same-day shipping
Shop Local · Support Independent

Every order helps keep your local hardware store on the corner.

Why we built NHG
You might find it for less locally. Independent retailers often offer competitive pricing — some products are even cheaper in-store than online.
Real expert advice — not search results. Independent hardware staff know their inventory and the local conditions you're working in.
Keep the neighborhood working. Every dollar spent at an independent retailer returns roughly 3x more to your local economy than at a national chain.

About Product Overview

Reliance PEX Lined Electric or Gas Water Heater Nipples — 3 in. Long, 3/4 in. Diameter

These Reliance nipples are purpose-built to connect your water heater to PEX piping with reliability and ease. The PEX-lined interior protects against mineral buildup and corrosion, helping maintain smooth flow and a tighter seal over time. With a compact 3-inch length and a 3/4-inch diameter, they fit neatly into tight spaces while delivering a sturdy, long-lasting connection for both electric and gas water heater installations.

Key benefits that set these apart

  • PEX-lined interior for enhanced durability: The lining helps resist mineral deposits and corrosion at the hot-water interface, supporting a longer service life for your connections.
  • Versatile compatibility: Suitable for electric or gas water heaters and designed to work with standard 3/4 in piping fittings, making it a practical upgrade for mixed-material plumbing systems.
  • Compact, space-friendly design: The 3-inch length fits in tight utility spaces often found behind compact or retrofit water heater setups.
  • Retail-ready packaging: Carded packaging protects the component and facilitates quick identification and handling in stores or during repairs.

Ideal use cases

  • Upgrading or repairing water heater connections in homes that utilize PEX piping, ensuring a clean transition from metal to PEX.
  • Retrofits where you’re replacing aging nipples and want a more durable, corrosion-resistant interior lining.
  • New installations in residential projects that employ PEX distribution networks and require reliable, straightforward connections to the heater.

Practical tips for installation and maintenance

As with any water heater connection, follow standard plumbing practices. Ensure mating fittings are clean and free of debris, and tighten to the manufacturer’s recommended torque to prevent leaks. After initial hot-water operation, check all joints for moisture and re-tighten if necessary. Periodic inspection of heater connections as part of routine maintenance helps catch issues early and preserve system integrity.

Choose the Reliance PEX Lined Electric or Gas Water Heater Nipples when you need a durable, PEX-friendly solution that simplifies transitions to PEX piping while delivering dependable performance in both electric and gas water heater setups.

The Details Specifications

Brand Reliance
SKU 4212437
UPC 020363109363
Unit 0
Case Pack Quantity 10 per case
Retail Unit Quantity 1
Unit of Measure 0 0
Dimensions (L × W × H) 1 × 8 × 6
Weight 1 lbs
Cubic Feet 0.02005 ft³
Country of Origin CHINA
Safety Data Sheet (SDS) Manufacturer documentation · opens in new tab

Compare products

{"one"=>"Select 2 or 3 items to compare", "other"=>"{{ count }} of 3 items selected"}

Select first item to compare

Select second item to compare

Select third item to compare

Compare