You're looking for a watertight connection between 2" PVC and an enclosure. Here's the best approach and options, keeping watertightness in mind

The Best General Method: PVC Conduit Hub or Adapter with a Locknut and Sealing Washer

This is the most reliable and common method for creating a watertight seal. Here's the breakdown:1. Conduit Hub (or Adapter)

This fitting has male threads on one side to screw into your enclosure and a female slip or threaded connection on the other side to accept the 2" PVC. Choose the appropriate hub based on whether your PVC is slip or threaded:

Slip PVC

Use a "PVC Conduit Hub for PVC Slip Conduit." This has a female solvent weld socket to receive the PVC.

Threaded PVC

Use a "PVC Conduit Hub for PVC Threaded Conduit." This has a female threaded connection to receive the PVC.2.

Drill the Hole

Drill a hole in your enclosure that's slightly larger than the outer diameter of the hub's male threads.3.

Sealing Washer

A must-have! Place a neoprene or rubber sealing washer onto the male threads of the hub. This washer will compress against the enclosure wall to create the initial watertight seal.4.

Insert and Tighten

Insert the hub through the hole in your enclosure.5.

Locknut

On the inside of the enclosure, thread a PVC locknut onto the male threads of the hub. Tighten the locknut firmly against the inside wall of the enclosure. The locknut presses the sealing washer against the outside of the enclosure.6.

Connect PVC



Slip

Apply PVC cement to the inside of the hub's female socket and the outside of the 2" PVC. Push the PVC firmly into the hub and give it a quarter-turn. Hold until the cement sets.

Threaded

Apply Teflon tape (pipe thread sealant) to the male threads of the PVC. Screw the PVC into the female threads of the hub. Tighten securely.

Why this method works best



Mechanical Seal

The locknut compresses the sealing washer, creating a reliable mechanical seal that isn't solely dependent on adhesive.

Common and Readily Available

All these components are standard electrical fittings and easy to find at any hardware store or electrical supply house.

Adjustable

You can tighten the locknut if the seal weakens over time.

Code Compliant

This is the standard method for watertight conduit connections in many electrical codes.

Key Considerations and Tips for Watertightness



Material Compatibility

Ensure the sealing washer is compatible with the materials of your enclosure and the PVC. Neoprene or EPDM are common choices. Silicone can also work well in certain applications.

Cleanliness

Clean the surfaces of the enclosure, the hub, and the PVC before assembly. Remove any dirt, grease, or burrs.

Tightening

Don't overtighten the locknut. You want a firm seal, but excessive force can damage the enclosure or the sealing washer.

Hole Size

Drill the hole accurately. Too small, and the hub won't fit. Too large, and the sealing washer won't be effective.

Thread Sealant

Always use Teflon tape (plumber's tape) or a thread sealant compound on threaded PVC connections.

Consider Vibration

If the enclosure or the PVC connection will be subject to vibration, use a flexible conduit section between the enclosure and the rigid PVC to prevent stress on the connection. This may require an additional fitting at both ends of the flexible section.

Test

After installation, test the connection by running water over it to check for leaks.

Specific Fitting Search Terms

"2 inch PVC conduit hub" "2 inch PVC conduit adapter" "2 inch PVC locknut" "Sealing washer for conduit" "PVC male adapter" (for threading into the enclosure)

Alternatives (Less Desirable in Most Cases)



Bulkhead Fitting (Potentially Overkill)

These are designed for going through tanks or walls. They typically have a threaded body and a large nut to tighten them. While very watertight, they are often more expensive and bulky than a simple conduit hub.

Direct Gluing (Not Recommended for Long-Term Watertightness)

You could try to directly glue the PVC to the enclosure, but this is very difficult to do reliably for a long-term watertight seal. The success depends heavily on surface preparation and adhesive selection, and it's not easily repairable. Expansion and contraction due to temperature changes can also break the adhesive bond.*

Rubber Grommet

This will not provide a long lasting seal.

In summary, the PVC conduit hub/adapter with a locknut and sealing washer is the most practical, reliable, and widely used method for creating a watertight connection between 2" PVC and an enclosure. Flag for review