What is the Darlly replacement for Unicel C-4440?

Darlly 40402 replaces Unicel C-4440. Both are 4-5/8" in diameter and about 16-3/4" long.

What Darlly cartridge replaces Pleatco PSD40?

Darlly 40402 replaces Pleatco PSD40.

What size is Darlly 40402?

Darlly 40402 is 4-5/8" in outside diameter and 16-3/4" long, with 40 sq ft of filter area.

Darlly 40402 Spa Filter Cartridge

Replaces Unicel C-4440 · Pleatco PSD40 (discontinued) · Filbur FC-2710

Darlly 40402 is a 40 sq ft spa filter cartridge, 4-5/8" x 16-3/4". It replaces Unicel C-4440, Pleatco PSD40 (discontinued) and Filbur FC-2710.

Specifications

Darlly part number	40402
Outside diameter	4-5/8"
Length	16-3/4"
Top end cap	castle
Bottom end cap	2-1/16" Open
Filter area	40 sq ft
Type	Spa
Darlly description	Sundance Spas

Cross-reference

Brand	Part numbers Darlly 40402 replaces
Unicel	C-4440
Pleatco	PSD40 (discontinued)
Filbur	FC-2710

Questions

What is the Darlly replacement for Unicel C-4440?: Darlly 40402 replaces Unicel C-4440. Both are 4-5/8" in diameter and about 16-3/4" long.
What Darlly cartridge replaces Pleatco PSD40?: Darlly 40402 replaces Pleatco PSD40.
What size is Darlly 40402?: Darlly 40402 is 4-5/8" in outside diameter and 16-3/4" long, with 40 sq ft of filter area.

Where to buy Darlly 40402

Pool and spa businesses in Florida, Georgia, South Carolina, Alabama, Mississippi, Louisiana and Texas order through their Grit Game rep. Everywhere else, contact Darlly Filtration directly.

Find your Grit Game rep Contact Darlly Darlly 40402 on darllyfilter.com

Cross-reference checked October 21, 2026 against Unicel's 2026 Replacement Guide, Pleatco's catalog (updated September 2025), filbur.com and darllyfilter.com. A competitor number is listed only when that brand's own data pairs it with the same cartridge size. Always compare the size and end caps of your old cartridge before ordering.

Brand names and part numbers are trademarks of their respective owners and are shown only to identify compatible replacements. Darlly Filtration is not affiliated with or endorsed by them. Cross-reference by The Grit Game, Darlly's sales agency.