Pentair Barrel union 2" NPT thread to 50mm PVC

Pentair Barrel Union — 2" NPT Thread to 50mm PVC (Part 200-903)

This genuine Pentair barrel union (Part No. 200-903) provides a secure, leak-free connection between 2" NPT-threaded pool equipment and 50mm PVC pipework. Commonly used when connecting Pentair pumps, filters, and pool cleaners to standard Australian PVC plumbing.

Key Details

• Part Number: 200-903
• Connection Type: 2" NPT thread to 50mm PVC
• Brand: Pentair
• Genuine replacement part

Common Applications

• Connecting Pentair pool pumps to 50mm PVC pipework
• Connecting Pentair pool filters and pool cleaners
• Replacing cracked, leaking, or damaged barrel unions
• New pool equipment installations requiring NPT-to-PVC adaptors

Frequently Asked Questions

What is a pool barrel union and what does it do?

A pool barrel union is a two-part threaded fitting that allows pool equipment to be disconnected from the plumbing without cutting pipes. One side threads onto the equipment (2" NPT), the other solvent-welds to 50mm PVC pipe — making servicing, replacing, or winterising equipment much easier.

What is Pentair part number 200-903?

Pentair part 200-903 is a genuine Pentair barrel union with a 2" NPT male thread on one end and a 50mm PVC socket on the other. It is a standard fitting used across many Pentair pool pump and filter installations.

Will this barrel union fit my Pentair pool pump?

This union is compatible with Pentair pool pumps, filters, and cleaners that use 2" NPT threaded connections paired with 50mm PVC pipework — the most common configuration in Australian pool installations. If you are unsure, contact our team with your equipment model number and we will confirm compatibility.

What is the difference between NPT and BSP thread on pool fittings?

NPT (National Pipe Taper) and BSP (British Standard Pipe) are different thread standards. Pentair equipment typically uses NPT threads. It is important to match the thread type on your equipment to avoid leaks. This fitting is 2" NPT — check your equipment specifications before ordering.

Can I use this barrel union to replace a cracked or leaking fitting?

Yes — this is a genuine Pentair replacement part designed as a direct swap for cracked, leaking, or damaged barrel unions on compatible Pentair equipment. Ensure you match the part number (200-903) and connection sizes before ordering.

Not sure if this is the right fitting for your setup? Contact our team with your equipment model and we'll confirm compatibility before you order.