Sta-Rite U9-373 o-ring for pump seal plateSta-Rite O-Ring for Seal Plate, U9-373$1699
Sta-Rite U9-373 o-ring for pump seal plate
Shop all Sta-Rite

Sta-Rite O-Ring for Seal Plate, U9-373

Ask a questionMPN U9-373
$1699
Out of stock
Get volume pricing Request a quote

30 day returns · Easy, with prepaid labels provided

Quick overview

  • Seal plate o-ring The seal that sits at the seal plate, part number U9-373.
  • Genuine Sta-Rite The factory part rather than a ring sized off the old one with calipers.
  • Replace when you open the pump An o-ring that has taken a set will not seal again once it has been disturbed.
  • Common cause of a leak Water tracking out at the seal plate joint usually means this ring, not the shaft seal.
  • Cheap next to the damage A leak here runs down onto the motor, which is a much more expensive failure.
  • Lubricate on assembly Use a pool rated silicone o-ring lubricant, never a petroleum grease.
Full description and specifications ↓

Need a hand?

Bilingual support from pool professionals.
(888) 751-8084CallChat with a techChatEmail usEmail

Send us a message

A pool professional will get back to you, usually the same business day.

About Sta-Rite O-Ring for Seal Plate, U9-373, SKU STA-101-2768. We will include it with your message.

We use your details to answer this message and nothing else.

Frequently bought together

Current item Sta-Rite O-Ring for Seal Plate, U9-373
Sta-Rite

O-Ring for Seal Plate, U9-373

$1699
Sta-Rite Pump Tank Body Housing Assembly, IntelliPro, 17307-0110S
Sta-Rite

Pump Tank Body Housing Assembly, IntelliPro, 17307-0110S

$30499
Sta-Rite Tank Body Assembly for Max-E-Glas II and Dura-Glas II, C176-59PZ
Sta-Rite

Tank Body Assembly for Max-E-Glas II and Dura-Glas II, C176-59PZ

$29699
Sta-Rite Max-E-Pro Seal Plate, C103-194PZ
Pentair

Sta-Rite Max-E-Pro Seal Plate, C103-194PZ

$7099
Sta-Rite Max-E-Glas/Dura-Glas Diffuser .75HP / 2.5HP Full Rated, C1-200PAZ
Sta-Rite

Max-E-Glas/Dura-Glas Diffuser .75HP / 2.5HP Full Rated, C1-200PAZ

$4399
Sta-Rite Seal Plate Kit for Max-E-Pro, Max-E-Glas II and Dura-Glas II C203-194P
Sta-Rite

Seal Plate Kit for Max-E-Pro, Max-E-Glas II and Dura-Glas II C203-194P

$17199
Sta-Rite Drain Plug with O-Ring, 1/4 in. NPT, U178-920P
Sta-Rite

Drain Plug with O-Ring, 1/4 in. NPT, U178-920P

$899
Subtotal

Similar products

Other products people compare with this one.

Sta-Rite U9-228A seal plate o-ring for Pinnacle pumps Sta-Rite Seal Plate O-Ring for Pinnacle, U9-228A$1799 Pentair 356173Z seal plate o-ring for the 3HP IntelliFlo3 pool pump Pentair Seal Plate O-Ring for 3HP IntelliFlo3 Pool Pump, 356173Z$1299 Sta-Rite J3-2 copper seal plate insert for pre 1998 pumps Sta-Rite Seal Plate Insert, Pre 1998$2299 Sta-Rite U9-161 O-19 o-ring for the 5 inch pump trap lid Sta-Rite O-Ring for 5" Trap Lid (O-19), U9-161$2099 Pentair 356148Z seal plate o-ring for the IntelliFlo3 VSF 1.5 HP pump Pentair Seal Plate O-Ring for IntelliFlo3 VSF 1.5 HP Pump, 356148Z$1299 Aladdin O-304-9 cartridge and seal plate o-ring, replaces 07-1445 and P-24263 Aladdin Cartridge and Seal Plate O-Ring for WhisperFlo and Purex, Replaces 07-1445 and P-24263, O-304-9$1499 Sta-Rite 35505-1437 trap lid o-ring for ABG series pool and spa pumps Sta-Rite Trap Lid O-Ring for ABG Series Pool and Spa Pumps, 35505-1437$899 Pentair 351446 WhisperFlo XF seal plate o-ring Pentair WhisperFlo XF Seal Plate O-Ring, 351446$1299 Pentair 357099Z square ring for the seal plate on Max-E-Pro and IntelliPro pumps Pentair Square Ring, Seal Plate, Max-E-Pro / IntelliPro, 357099Z$1899 Sta-Rite 17351-0009 new style water slinger for pool pump motor shafts Sta-Rite Water Slinger For Dyna-Jet/Glas/Max/Pro, 17351-0009$899
Sta-Rite C35-43 motor vibration pad for Max-E-Pro pumps Sta-Rite Motor Pad for Max-E-Pro Pumps, C35-43$1499 Sta-Rite U9-389 housing O-Ring for the PLBC booster pump Sta-Rite Housing O-Ring 9"x9-1/2"x.275, U9-389$1099 Sta-Rite C108-33P strainer basket for Dura-Glas and Max-E-Glas pumps Sta-Rite Strainer Basket for Dura-Glas and Max-E-Glas Pumps, C108-33P$2099 Pentair Sta-Rite OEM Shaft Seal Without Copper Insert | 17304-0100S Pentair Sta-Rite OEM Shaft Seal Without Copper Insert | 17304-0100S$2199 Aladdin B-33 5 inch pump strainer basket Aladdin Replacement Pump Strainer Basket for Sta-Rite, Premier and Aqua-Flo Pumps, 5 in., B-33$1108 Aladdin GO-KIT 71 seal kit for the old style Polaris PB4-60 booster pump Aladdin GO-KIT 71 Seal Kit for Polaris PB4-60 Booster Pump$1699 Jandy R0449100 pump lid seal gasket with o-ring Jandy Pump Lid Seal Gasket with O-Ring, R0449100$1999 Pentair 355619Z SuperFlo and Pinnacle seal bracket O-ring Pentair SuperFlo Seal Bracket O-Ring, 355619Z$1699 Jandy R0480300 backplate o-ring for FloPro FHPM and VS-FHP series pumps Jandy Backplate O-Ring for FHPM and VS-FHP Series Pumps, R0480300$2299 Pentair LA415 rubber volute O-ring for the Letro booster pump Pentair Volute O-Ring for Letro Booster Pump, LA415$899

Product details

The Sta-Rite U9-373 is the o-ring for the seal plate on Sta-Rite pool pumps. It is a small static seal doing an important job: keeping pumped water inside the pump instead of letting it track out at the seal plate joint and run down onto the motor.

Replace it when the pump comes apart

O-rings take a set in service. Once one has been compressed for a few seasons and is then disturbed, it rarely seals as well going back together, which is why this is a standard replacement item on any pump strip down. Lubricate the new ring with a pool rated silicone o-ring lubricant, not a petroleum grease.

Check the number for your pump

Seal plate o-rings differ between Sta-Rite pump families and the wrong size is a leak you will chase twice. Match U9-373 against the parts breakdown for your exact pump model before you order.

From Pool School

How to Prime a Pool PumpFrom the breaker to a full pot, each manufacturer's time limit, and what to check when it will not catch prime. Read Replace the Pool Pump Motor or the Whole Pump?The manufacturers' tests first, what each repair replaces, and the federal motor rule. Read
Specifications
Brand Sta-Rite
Manufacturer part number U9-373
UPC 788379850975
Type O-ring
Location Seal plate
Part type Pool pump part
Shipping weight 0.1 lb
Ships Parcel

Request a quote

Need a volume price, a freight quote, or pricing in writing before you order? We reply the same business day.

Request a quote

Customer reviews

More from Sta-Rite

Pentair 170145 cartridge pack for Sta-Rite System 3 S7M120, inner and outer cartridges Sta-Rite 170145 System 3 S7M120 Large and Small Cartridge Set, 25021-0200S and 25022-0201S$46799 Pentair 461105Z MasterTemp and Max-E-Therm six button control board kit Pentair Genuine OEM MasterTemp/Max-E-Therm 6-Button Control Board Kit, 461105Z$53899 Pentair 272568Z six position top mount clamp valve top assembly Pentair 6-Position Top Mount Clamp Valve Top Assembly, 272568Z$15199 Filbur FS-3037 full 11 grid set for the Sta-Rite System 3 S7D75 DE filter Filbur Sta-Rite S7D75 Full Filter Grid Set (11 Grids), FS-3037$24599 Sta-Rite 08428-0125 SwimQuip white inlet face plate and eyeball kit with screws Sta-Rite Face Plate Inlet Eyeball Kit with Screws, 08428-0125$3499 Sta-Rite 17307-0110S pump tank body assembly for IntelliPro and Max-E-Pro pumps Sta-Rite Pump Tank Body Housing Assembly, IntelliPro, 17307-0110S$30499 Sta-Rite 27002-0300S 300 square foot MOD media replacement filter module for the PLM300 Sta-Rite 300 Sq. Ft. Filter Replacement MOD Media, 27002-0300S$56999 Pentair 170147 large and small cartridge filter pack for the Sta-Rite System:3 S8M150 Pentair Sta-Rite S8M150 Large and Small Cartridge Filter Pack 25021-0202S & 25022-0203S, 170147$76799 Sta-Rite 27001-0020S System 2 black upper tank shell half Sta-Rite System 2 Tank Shell Upper Half, Black, 27001-0020S$28799 Sta-Rite 77707-0054 Max-E-Therm igniter with gasket kit Sta-Rite Max-E-Therm Igniter with Gasket Kit, 77707-0054$9499
Sta-Rite 178745Z 12.5 in. Posi-Clear RP replacement filter lid, top view Sta-Rite 150/200 Sq Ft Posi-Clear RP Replacement Lid, 12.5 in., 178745Z$15499 Sta-Rite C176-59PZ tank body assembly for Max-E-Glas II and Dura-Glas II pumps Sta-Rite Tank Body Assembly for Max-E-Glas II and Dura-Glas II, C176-59PZ$29699 Pentair 474957 combustion chamber assembly for Sta-Rite Max-E-Therm heaters Pentair Combustion Chamber Assembly for Max-E-Therm Heaters, 474957$37299 Pentair Sta-Rite 474061 cupro nickel tube sheet coil assembly kit for MasterTemp 400NA and 400LP Sta-Rite Tube Sheet Coil Assembly Kit for Model 400NA, 400LP MasterTemp Heater, 474061$1,22199 Sta-Rite C103-194PZ Max-E-Pro pump seal plate, front view Sta-Rite Max-E-Pro Seal Plate, C103-194PZ$7099 Sta-Rite 24850-0105 air relief valve and pressure gauge assembly for System 3 filters Sta-Rite Valve and Gauge Assembly for System 3 Filters, 24850-0105$11099 Pentair 08650-0022 hinged weir door assembly for Sta-Rite and SwimQuip U-3 skimmers Pentair Weir Assembly for Sta-Rite U-3 Skimmer, 08650-0022$3899 Pentair 154712 sand filter drain cap Pentair Genuine OEM Sand Filter Drain Cap, 154712$3399 Pentair 356893Z IntelliPro VSF drive kit with keypad, black Pentair IntelliPro VSF Drive Kit with Keypad, Black, 356893Z$1,22699 Sta-Rite 42001-0061S air flow switch for Max-E-Therm SR200, SR333 and SR400 heaters Sta-Rite Max-E-Therm Air Flow Switch, 42001-0061S$15799

Questions and answers

What people ask about this product, answered by our pool techs.

Which o-ring is this?
The seal plate o-ring, Sta-Rite part number U9-373.
Will it fit my Sta-Rite pump?
Check U9-373 against the parts breakdown for your exact pump model before ordering. The same seal plate o-ring number is called out on more than one Sta-Rite pump family, and neighboring models use different sizes.
Is this the shaft seal?
No. The shaft seal is a separate part. This is the static o-ring at the seal plate joint.
Do I need o-ring lubricant?
Use a pool rated silicone lubricant on assembly. Petroleum grease swells the rubber and ruins the seal.
Ask your own question