3890CV Mechanical Seal (PS-3890V-CMS) — 5/8″ | Hayward TriStar, EcoStar & Polaris PB4-60 Pool Pumps

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

3890CV Mechanical Seal (PS-3890V-CMS) — 5/8″ | Hayward TriStar, EcoStar & Polaris PB4-60 Pool Pumps

Weight	.25 lbs
Dimensions	1.5 × 1.5 × 1.25 in

QTY	Price
3890CV Mechanical Seal (PS-3890V-CMS) — 5/8" \| Hayward TriStar, EcoStar & Polaris PB4-60 Pool Pumps quantity	$13.00

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DESCRIPTION

Mechanical Seal 3890V — Type 166 / T-16 (5/8″) | PS-3890V-CMS

Equal to industry standard 3890V / PS-3890V-CMS
Direct-fit Type 166 / T-16 single-spring seal for pool/spa and small-pump applications—upgraded with Viton elastomers and a machined carbon/ceramic face set for longer service life.

At-a-glance specs: 5/8″ shaft • 1.381″ / 1.375″ × 0.406″ cup seat • Molded carbon/ceramic faces • Viton elastomers

Fits: Hayward TriStar®, EcoStar® and NorthStar® (SPX3200SA, SPX4000), Jandy, and Polaris PB4-60Q and PB4-60 booster pumps made from late 2011 on (P84-3, R0479400). Polaris PB4-60 pumps made before late 2011 take the PS-1000.

Same seal, same size, same fit — what changes is the rubber. Both seals below are the PS-3890 for a 5/8? shaft, with the same molded carbon face and ceramic seat, and both fit the same pumps. The only difference is the rubber: standard Nitrile or upgraded Viton. Pick the one that suits your water.

Seal	Material	Best For This Water
3890c	Molded carbon face, ceramic seat, Nitrile rubber	Normal chlorine, normal temperature, clear water. The standard build for a home pool or spa.
3890cv	Molded carbon face, ceramic seat, Viton rubber	Saltwater or higher chlorine, and warmer water. Viton holds up where standard Nitrile hardens and cracks.

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

SPECIFICATIONS
Cross references & alternative part numbers

OEM Numbers: None available

Brands: None available

Nameplate Data: None available

Also known as / searched as
- 3890V mechanical seal
- PS-3890V-CMS mechanical seal
- 3890V-CMS mechanical seal
- 3890cv mechanical seal
- 3890 CV mechanical seal
- Type 166 mechanical seal 5/8
- T-16 mechanical seal 5/8
- pool pump mechanical seal 5/8 Viton
- spa pump mechanical seal 5/8 Viton
Common searches
PS-3890V-CMS, PS 3890V CMS, PS3890VCMS, 3890V, 3890 V, 3890V-CMS, 3890VCMS, 3890cv, 3890 cv, T-16 5/8 seal, Type 166 5/8 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) — 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.