Darlly Cartridge [35 sq ft, 2-1/8" OD Top x 2-1/8" OD Bottom x 4-15/16" dia x 13-5/16" L] (40371)

Darlly 40371 FC-2380 C-4637 PC-2380 PRB37-IN Spa/Pool Filter Cartridge

Type:	Filters
Mfg	Darlly Filtration
Mfg Part #	40371
Hzn Part #	17-777-1603
Filbur Part #	FC-2380
Pleatco Part #	PC-2380, PRB37-IN, PRB37-IN-3
Unicel Part #	C-4637
Aladdin Part #	13701
Darlly Part #	40371
Replaces:	13701, 40371, 645544023803, AK-3048, C-4637, FC-2380, PC-2380, PLE-051-9557, PRB37-IN, PRB37-IN-3, R173430
Top Style:	Open
Top Dimension:	2-1/8"
Bottom Style:	Open
Bottom Dimension:	2-1/8"
Length:	13-5/16"
Square Feet:	37
Outside Diameter:	4-15/16"
Works With:	Freedom Spas, Infinity Spas, Leisure Bay/Rec Whs, Maax Spas, Maax Spas/Statewood Spas, Maax Spas/T. Bahama Spas, Morgan Spas, Phoenix Spas, Rainbow/Pentair, Rec Whs/Leisure Bay, Savannah Spas, Statewood Spas (Maax Spas), T. Bahama Spas (Maax)

COMPARE AT $52.49

OUR PRICE $41.99

STOCK STATUS IN STOCK Ships Usually The Same/Next Business Day

Quantity

✓ $9.88 Standard Shipping
Under 25 lbs. Contiguous USA ✓ Secure Checkout
Safe & secure ✓ Expert Parts Support
We’re here to help

Helpful Filter Related Articles

The Golden Rules Of Filter Care: When To Rinse, Deep Clean, and Replace

Your hot tub filter is one of the most important parts of your spa water care system. It traps dirt, oils, lotions, hair products, debris, and fine...

Read Article

Understanding Your Hot Tub Circuit Board

This is a simple guide to understanding how to properly identify your spa control system circuit board, at least enough t...

Read Article

Spa & Pool Filter Cartridge Cleaning Guide

For swimming pools, clean the cartridge when the filter canister pressure reaches 8 PSI above the initial system or new ca...

Read Article

SHARE & GET $10 FOR EVERY FRIEND WHO JOINS US & MAKES A PURCHASE!

TAGS: darlly, filters

Details

The Darlly 40371 filter cartridge is made for compatible filtration systems that require 35 square feet of media with 2-1/8 inch top and bottom openings. Its 4-15/16 inch diameter and 13-5/16 inch length provide a compact but efficient design for housings that depend on these precise measurements.

Not every cartridge replacement is about moving up in size. Often, the best result comes from choosing the exact dimensions the system was originally designed to use. This cartridge helps restore filtration performance while maintaining the intended fit and alignment inside the housing, which can make ongoing maintenance more straightforward.

The Darlly 40371 is a practical choice for compatible systems where a 35 square foot cartridge with matching 2-1/8 inch end openings and a compact body is required.

Darlly replacement filter cartridge
35 square feet of filtration area
2-1/8 inch top and bottom openings
4-15/16 inch diameter x 13-5/16 inch length
Designed for compatible compact filtration systems

Darlly Filtration – Pool & Spa Filter Cartridges and Replacement Filters

Who is Darlly Filtration?

Darlly Filtration is a global leader in the manufacturing of pool and spa filter cartridges, known for producing high-quality, OEM-compatible replacement filters. With advanced engineering and large-scale production capabilities, Darlly supplies filters used by major brands worldwide. Their reputation for consistency, performance, and value has made them a trusted choice for both residential and commercial pool and spa owners.

What products does Darlly Filtration specialize in?

Darlly specializes in filter cartridges and replacement filters for pools, spas, and hot tubs. Their product lineup includes pleated filter cartridges designed to capture fine debris, dirt, and contaminants while maintaining optimal water flow. Darlly filters are available in a wide range of sizes and configurations, making them compatible with many leading equipment brands.

Why choose Darlly Filtration parts for your pool or spa?

Darlly filters are known for high filtration efficiency, durability, and cost-effective performance. Their cartridges are engineered to provide excellent water clarity while extending filter life and reducing maintenance frequency. Customers choose Darlly for reliable replacement filters that offer a strong balance of quality, compatibility, and value.

How do you identify and choose the correct Darlly Filtration part?

To select the correct Darlly filter, it’s important to match your existing cartridge’s dimensions, including length, diameter, and top/bottom configuration. Cross-referencing part numbers or filter model compatibility ensures proper fit and performance. You can use our FILTER FINDER to help you find the proper filter in minutes. Choosing the correct filter helps maintain water clarity, improve system efficiency, and protect pool and spa equipment.

Need help finding the right Darlly Filtration part?

At Bath & Spa Parts Online, we carry a wide selection of Darlly Filtration pool, spa, and bath parts ready to ship. Can’t find what you need? Contact our Product Specialists at 800-918-9143, use the live chat, or visit our Contact Us page. For installation guides, part diagrams, and troubleshooting resources, visit the Bath & Spa Parts Online Knowledge Base for expert support.