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Pool O-Rings for Harmsco

All Pool O-Rings are manufactured to meet the demanding requirements of the pool, spa and pump insdustries. The O-Ring Store LLC O-Rings are directly interchangeable with those of original equipment manufacturers and meet or exceed the needs and expectations of our customers. The original equipment manufacturers (OEM) names and part numbers are used for reference purposes only. The O-Ring Store LLC does not imply that any part shown is the product of these manufacturers.

Image Model+ Item Name Qty. Price Quantity Discounts
O-Ring For 35505-1424 Sta Rite System 3 35505-1424

O-Ring For 35505-1424 Sta Rite System 3

Replacement Pool O-rings 930 Harmsco BF96, BF144 Cartridge Filter Holding Rod O-ring Parts Cross: Caretaker 413-0640 Union Assembly O-ring Caretaker...


Quantity Discounts
552 Harmsco Holding Rod O-ring O-273

552 Harmsco Holding Rod O-ring

Replacement Pool O-rings This a replacement O-ring also used for the following part numbers: Harmsco 552 Holding Rod O-Ring Waterway™ Plastics...


Quantity Discounts
201 Harmsco Pump Seal PS-201

201 Harmsco Pump Seal

PS-201 Shaft Seal Assembly Type: A - Shaft Dia.: 3/4" Description: 3/4" Shaft Premium Seal Buna / Graphitic Plastic SS with Ceramic Seat...


Quantity Discounts

Stock O-Rings in over 20 different compounds and durometers the following six are the standard rubber materials in a range of durometers (Shore A) hardness to satisfy practically any service condition:

Viton® O-Rings / FKM: Fluorocarbon (Viton®) exhibits exceptional resistance to chemicals, oils, temperature extremes (-13°F to +446°F), low compression set, low gas permeability and excellent aging characteristics. Applications include: aircraft engines, automotive fuel handling systems, and chemical processing industries. FKM is also suitable for high vacuum applications. It is not recommended for exposure to ketones, alkalis, and Skydrol® fluids. Custom compounds are available with improved chemical and low temperature resistance.
AS-568 Viton® O-Rings | Metric Viton® O-Rings

Buna-N O-Rings / Nitrile O-Rings / NBR: Nitrile (Buna-N) is the most widely used elastomer due to its excellent resistance to petroleum products, operating temperature range (-40°F to +257°F) and one of the best performance-to-cost values. It's an ideal material for aerospace, automotive, propane and natural gas applications. Special Hydrogenated Nitrile (HNBR) compounds can improve resistance to direct ozone, sunlight, and weather exposure while increasing temperature range to +300°F.
AS-568 Buna-N O-Rings | Metric Buna-N O-Rings

Ethylene-Propylene / EPDM O-Rings: EPDM has outstanding resistance to heat, water and steam, alkali, mild acidic and oxygenated solvents, ozone, and sunlight (-40ºF to +275ºF); but it is not recommended for gasoline, petroleum oil and grease, and hydrocarbon environments. This popular rubber compound is usually the first choice for low torque drive belt applications.
AS-568 EPDM O-Rings | Metric EPDM O-Rings

Fluorosilicone O-Rings / FVMQ: Fluorosilicone (-75º to +400ºF) combines the good high and low temperature stability of silicones with the fuel, oil, and solvent resistance of fluorocarbons. FVMQ is unparalleled for aerospace fuel systems, auto fuel emission control systems and to meet or exceed government, military, aerospace, automotive, industrial and commercial specifications. However, due to relatively low tear strength, high friction and limited abrasion resistance of these materials, they are generally not used in dynamic applications. They are also not recommended for exposure to brake fluids, hydrazine, or ketones.
AS-568 Fluorosilicone O-Rings | Metric Fluorosilicone O-Rings

Silicone O-Rings / VMQ: In the Silicone family, you will find compounds which are superior as static seals in extreme temperature conditions. Standard compounds handle operating temperatures -85º to +400ºF. Silicone compounds are popular in food and medical applications because they are very clean and do not impart odor or taste. Special Phenyl silicones can be used down to -148°F.
AS-568 Silicone O-Rings | Metric Silicone O-Rings

Neoprene® O-Rings / CR: Neoprene (-40º to +250ºF) is reasonably priced and features good resistance to petroleum oils, ozone, sunlight and oxygen aging, relatively low compression set, good resilience and outstanding physical toughness. It is the preferred sealing material for the refrigeration industry because of its resistance to ammonia and Freon®.
AS-568 Neoprene® O-Rings