516 Mechanical Seal (PS-516) — 5/8″ | Hayward Max-Flo II & Pentair SuperFlo Pool Pumps

ps-100 , ps-200 , ps-201 mechanical seal

516 Mechanical Seal (PS-516) — 5/8″ | Hayward Max-Flo II & Pentair SuperFlo Pool Pumps

Weight	.25 lbs
Dimensions	1.5 × 1.5 × 1.25 in

QTY	Price
516 Mechanical Seal (PS-516) — 5/8" \| Hayward Max-Flo II & Pentair SuperFlo Pool Pumps quantity	$6.50

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DESCRIPTION

Mechanical Seal 516 — Type 166 / T-16 (5/8″) | PS-516

Equal to industry standard 516 / PS-516.
Direct-fit Type 166 / T-16 single-spring seal for pool/spa and small-pump applications—built with a machined carbon/ceramic face set and Buna-N elastomers for dependable everyday service.

At-a-glance specs: 5/8″ shaft • 1.25″ × 0.406″ cup seat • Machined carbon/ceramic faces • Buna-N elastomers

Fits: Hayward Max-Flo II® and Max-Flo VS (SPX1250XZ2), Pentair SuperFlo® and SuperFlo VS (354545S), Pentair / Pac-Fab Challenger®, Dynamo®, Dynatron® and Pinnacle®, Sta-Rite Dura-Glas® and Max-E-Glas® Series PE, PEA, P2R and P2RA, plus Speck, Waterway, Jacuzzi, Astral Pool and Doughboy pool and spa pumps. Pentair SuperFlo VST, the original Hayward Max-Flo (SP2800X) and Dura-Glas II / Max-E-Glas II take the PS-201; pre-1998 Dura-Glas takes the PS-100.

Same seal, same size, same fit — what changes is the material and how it’s built. All five seals below are the PS-200 for a 5/8″ shaft, and all five fit the same pumps. They differ in two ways. The build: a molded carbon face or a premium carbon face machined from solid stock. The materials: a ceramic or silicon carbide seat, and Nitrile or Viton rubber. Pick the one that suits your water.

Seal	Material	Best For This Water
200c	Molded carbon face, ceramic seat, Nitrile rubber	Normal chlorine, normal temperature, clear water. The standard build for a home pool or spa.
200cv	Molded carbon face, ceramic seat, Viton rubber	Saltwater or higher chlorine, and warmer water. Viton holds up where standard Nitrile hardens and cracks.
516	Machined premium carbon face, ceramic seat, Nitrile rubber	Saltwater pools with a chlorine generator, commercial pools, or any pump that runs most of the day.
3867	Machined premium carbon face, ceramic seat, Viton rubber	High chlorine and hot water — heated spas, therapy pools, heavy commercial duty.
200cvss	Silicon carbide face and seat, Viton rubber	Sandy, dusty or gritty water, or any pump where seals keep failing early. The hardest faces we offer.

Explore our full lineup of Single Spring Seals—PS replacements, pool/spa seals, and our SPS line.

Looking for more? Shop Pump Repair Kits, Parts & Accessories, and Pre-Cut Gaskets.

Have questions? Check out our Pool/Spa Small Pump Guide or call us anytime—we’re here to help.

Please click “specifications” below for OEM numbers and Pump Nameplate Data

SPECIFICATIONS
Cross references & alternative part numbers

OEM numbers: S20788, S20789, S20994 , DP0304 , W105-7A , 74297284 , SP1250XZ2C , 2120-0008 , 48273 , 14010242 , 0118, 101.000.110C , 118.000.102, 118.000.110 , S20788 , 70X102-M

Brands: BELL & GOSSETT (A XYLEM Brand) , BERKELEY PUMPS (A PENTAIR Brand) , CH&E MFG. COMPANY , FLOWSERVE CORPORATION , HAYWARD INDUSTRIES, INC. , HYPRO CORPORATION , MAGNUM PRODUCTS, LLC. , PACO , PRICE PUMP COMPANY , SCOT PUMP (A WILO USA Brand) , STA-RITE INDUSTRIES , TEEL PUMP , WEBER INDUSTRIES, INC.

Nameplate Data: 1P746-851-860-896-897-952-955-996, 1P998, 2P004-006-390, 2P091, 2P092 3P551-3P553, 3P577

Also known as / searched as
- PS-516 mechanical seal
- 516 mechanical seal
- Type 166 mechanical seal 5/8
- T-16 mechanical seal
- pool pump mechanical seal 5/8
- spa pump mechanical seal 5/8
- machined carbon ceramic pump seal
PHYSICAL PROPERTIES
Seal House Type 166
Our Type 166 configuration combines the best design elements we’ve refined over the years to deliver superior reliability and performance.

Key advantages include:
- Crimped rotary face with positive drive — securely held in place to prevent dislodgement during installation.
- Full metal retainer with positive drive — ensures strength and long-term durability.
- Full rubber bellows construction — provides complete sealing along both the shaft and face, rather than relying on a small O-ring or partial gasket.
- Molded/machined carbon face (never plastic) with upgrade options — delivers extended service life.
Compatibility & upgrade:

The Type 166 is designed to replace most small seal types commonly used in pool and spa applications, including Type 16, G, A, 6, AV, 2100, and more. Even in its basic form, this seal is a significant upgrade over standard “pool” seals typically available on the market.

Disclaimer: Seal House USA provides aftermarket replacement parts. Any OEM names are used strictly for cross-reference. We are an independent supplier.