Waterway Heater Union Gasket O-Ring | 2" | 711-4030

The Waterway 711-4030 2" Heater Union Gasket O-Ring is built to maintain a reliable seal on 2 inch heater and pump union connections, using a durable rubber construction that stands up to constant pressure and temperature changes. Its molded O-ring ridge matches the original genuine Waterway design, helping the gasket seat securely against the union face to prevent leaks and maintain consistent system flow. This gasket aligns with the dimensions and fitment used across many Waterway-style 2 inch unions found on heaters, pumps and spa plumbing assemblies. Installing a fresh gasket helps restore sealing performance when the older one has flattened, cracked or lost elasticity, supporting dependable operation and easier long-term maintenance.

Highlights

• 2 Inch Union Fit: Sized for standard 2 inch heater and pump unions, providing the correct sealing surface that aligns with Waterway-style union faces for dependable compression.

• Durable Rubber Design: Molded from resilient rubber that resists chemical exposure, water pressure cycling and heat variations common in pool and spa systems.

• OEM-Style Profile: Features a raised O-ring ridge that mirrors the original Waterway gasket layout, helping the seal stay properly centered within the union connection.

• Leak-Prevention Use Case: Ideal for addressing slow drips or moisture buildup around 2 inch heater unions where aging gaskets can lose their sealing properties over time.

• Service-Friendly Component: Straightforward to install during heater service or plumbing updates, ensuring the union joint maintains proper sealing and long-term reliability.

Additional Info

For online buyers, the Waterway 711-4030 2″ Heater Union Gasket/O-Ring provides a reliable seal for heater unions using 2″ or 2½″ fittings. This guide explains how to confirm compatibility before ordering, how to install the gasket after delivery and how to maintain leak-free operation.

Checking Fitment Before Ordering Online

This gasket features a ~2-1/8″ inner diameter and ~2-15/16″ outer diameter and fits many Waterway-style heater and pump unions. It is commonly used when replacing worn or flattened gaskets during heater service.

How to confirm online that my heater union uses the 711-4030 gasket

Whether this gasket fits both Waterway and compatible aftermarket unions

Can I order multiple gaskets together for free or fast shipping

What measurements to verify before placing an online order

Whether this gasket fits both heaters and circulation pump unions

Installing the Gasket After Delivery

Once received, the ribbed sealing edge should be aligned cleanly in the union groove and tightened evenly to avoid distortion. Proper seating prevents leaks during pressure spikes or heating cycles.

How to install the 711-4030 gasket so it seals on the first startup

Whether lubrication helps seat the ribbed gasket more easily

What to do if the union continues to leak after replacing the gasket

How to inspect tailpieces for warping caused by heater temperatures

Whether compatible unions or tailpieces are available online if needed

Keeping Heater and Pump Connections Leak-Free

A secure union gasket supports stable pressure, reduces heater wear and prevents water loss over time. Replacing old gaskets ensures long-term reliability across heating cycles.

Why 2″ gaskets wear faster in hot-water spa systems

How often to reorder Waterway 711-4030 gaskets for proactive maintenance

Whether this gasket qualifies for free shipping with additional parts

How to detect early weeping leaks before they escalate

Are online bundles available that include this gasket with union components