Pentair 3.5" Bulkhead Adapter Nut, White | 274407
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The Pentair 3.5" Bulkhead Adapter Nut (274407) is a genuine replacement component designed for Pentair pool filtration systems that use bulkhead plumbing connections. This durable white adapter nut secures the bulkhead fitting in place, helping maintain a tight, leak-free seal between filter tanks and plumbing lines.
Manufactured from chemical-resistant materials, the nut withstands exposure to pool chemicals and outdoor conditions while ensuring dependable plumbing performance.
Pentair 3.5" Bulkhead Adapter Nut (274407) Compatibility
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Compatible with Pentair pool filtration systems using 3.5-inch bulkhead fittings
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Suitable for Pentair filter tank plumbing assemblies
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Works with select Pentair sand and DE filters
Frequently asked questions
How do I confirm the size of this fitting?
PVC is sized by nominal pipe size, which does not match the physical measurement - 2 inch pipe measures about 2.375 inches across the outside. Measure the outside diameter of your pipe and compare it with the specification above rather than measuring the inside.
What is the part number for this fitting?
Pentair lists this fitting under part number 274407. Quote 274407 when you cross-reference against your equipment manual, an existing part, or a parts diagram, so you are comparing the same revision.
What is the difference between slip and threaded connections?
Slip connections are solvent welded with primer and cement to make a permanent joint. Threaded connections use tape or sealant and can be taken apart later, which is why they are used where equipment may need to be removed for service.
How do I confirm this fits my equipment?
Match the part number stamped on the component you are replacing, or look it up in the parts list for your Pentair equipment. If your model or serial number is not named on this page, send it to us before you order and we will confirm the fit.
Is Schedule 40 or Schedule 80 right for my job?
Schedule 40 handles typical residential pool plumbing. Schedule 80 has thicker walls and a higher pressure rating and is used in commercial installations and on the discharge side of high-head systems. The two share the same outside diameters, so they connect to each other.
Is there a warranty on this fitting?
It carries the standard Pentair manufacturer warranty. The terms are set by Pentair, and on some equipment the coverage only applies when a licensed professional performs the installation. Keep the receipt and packaging until you have confirmed correct operation.