The Pentair 2-Inch Slip Half Union 42001-0402 is an OEM replacement kit designed for Sta-Rite Max-E-Therm pool and spa heaters. This kit includes two slip unions, two locking nuts, two couplers, and two O-rings, providing everything needed to form a secure and leak-resistant connection between the heater and the pool plumbing system. These unions make it easy to disconnect and reconnect the heater during routine service, repairs, or replacements, helping reduce downtime and simplify maintenance tasks. Constructed to meet OEM Pentair specifications, the unions are built to withstand pool chemicals, water pressure, and frequent use without compromising reliability. By maintaining strong and consistent connections, this kit helps extend the life of your Max-E-Therm heater and ensures it continues to operate safely and efficiently.

• OEM Union Kit: Specifically designed for Sta-Rite Max-E-Therm heaters, providing durable and precise connections that match original factory specifications.

• Complete Package: Includes two 2-inch slip unions, two couplers, two locking nuts, and two O-rings for a full installation or replacement.

• Leak-Free Operation: Creates a secure seal that prevents leaks and protects the heaterÕs performance during routine use and high-pressure operation.

• Maintenance Friendly: Makes disconnecting and reconnecting the heater straightforward, saving time on servicing or system upgrades.

• Durability Assured: Manufactured to OEM Pentair standards with rugged materials that resist pool chemicals and environmental exposure.

• (2)ÊLocking Nuts
• (2)ÊCouplers
• (2)ÊO-Rings

• Pentair Sta-Rite Max-E-Therm Heaters

Need help with the Pentair 2-Inch Slip Half Union 42001-0402? This section covers installation, maintenance, and in-store availability for Sta-Rite Max-E-Therm heaters.

Installing the 42001-0402 Union Kit

This kit comes with two 2-inch slip unions, couplers, and O-rings, making it easy to connect your heater to the plumbing system.

How do I install the Pentair 42001-0402 slip union kit on a Max-E-Therm heater?

Can I buy the 2-inch unions in store for same-day pickup?

Do I need PVC glue or sealant when installing the union kit locally?

Troubleshooting Heater Connection Issues

Leaking or loose unions can cause flow problems and heater shutdowns. This kit solves common connection failures.

Will the 42001-0402 kit stop leaks in my Sta-Rite Max-E-Therm plumbing?

What should I do if the O-rings wear out or donÕt seal correctly?

Can I walk into the store and replace just the O-rings from this kit?

Confirming the Right Kit In Store

Verifying compatibility before purchase saves time and avoids returns.

How do I confirm in store that 42001-0402 fits my Max-E-Therm heater?

Is the Pentair slip union kit available today at Discount Pool Mart?

Can I bring in my old union to match it with the 42001-0402 kit?