Seals, gaskets, and O-rings can look like simple rubber parts until you're holding one that doesn't fit the groove, shaft, or cylinder it's supposed to protect. The decision starts with the job: is the leak around a pump shaft, a hydraulic cylinder, a rotating shaft, or a standard O-ring groove? Once you know that, four products here split into four very different use cases. A water-pump mechanical seal, a Case backhoe dipper seal kit, a rotary-shaft TC oil seal, and a 125-count Viton O-ring pack all serve different equipment, so the right pick is the one that matches the application and the dimensions of the old part.
Quick Take
These four products are not variations of one seal; they are four different sealing jobs in one roundup. There is a water-pump mechanical seal, a Case backhoe dipper cylinder seal kit, a rotary-shaft TC oil seal, and a bulk pack of Viton O-rings. Match the application first, then use the table and notes to narrow the choice.
Price Comparison
| Product | Listed Price | Price Bar |
|---|---|---|
| Zaplyte Water Pump Mechanical Seal | USD 14.59 | |
| Case Backhoe Dipper Hydraulic Cylinder Seal Kit | USD 35.00 | |
| JSB TC Oil Seal | USD 7.80 | |
| Mr. O-Ring Black Viton O-Ring Pack | USD 9.99 |
Match the Seal to the Job
- If your leak is in a water pump or submersible pump, the Zaplyte mechanical seal is the direct candidate.
- If you are rebuilding a backhoe dipper hydraulic cylinder, the hydraulic cylinder seal kit is the targeted choice for that cylinder.
- If you need a rotary-shaft grease seal with TC-style construction, the JSB TC oil seal is the one to compare against your old seal.
- If you want a large O-ring supply in one standard size, the Mr. O-Ring bulk Viton pack gives you the volume.
Zaplyte 2 Pcs 10mm Internal Diameter Industrial Mechanical Seal for Water Pump
What makes this set worth picking: it includes two mechanical seals for water pumps and submersible pumps, each built with a single coil spring and rubber bellows. The 10mm internal diameter and 22 x 29mm overall size give you a clear fit reference, and the carbon, rubber, and metal construction suits sealing jobs around water, effluent plants, refrigeration, and air conditioning.
The catch: this set is anchored to a 10mm internal diameter. It gives you two identical seals, so you are buying a specific fit rather than an assortment.
Backhoe Dipper Hydraulic Cylinder Seal Kit for Case Industrial 580K, 580SK, 580SL
Reach for this kit when you're working on the backhoe dipper cylinder of a Case Industrial 580K, 580SK, or 580SL. The rod diameter is 2.50 inches and the bore diameter is 5.00 inches, and the kit references OEM cylinder numbers such as 126151A1, 183795A1, 183795A2, 183795A3, 183795A4, G110694, and G110702.
Keep in mind that this is a specific hydraulic cylinder seal kit for those Case applications, not a universal seal set. If the cylinder you're repairing isn't one of those Case models, this kit isn't the one to start with.
JSB TC Oil Seal 15X25X7 mm NBR Nitrile Double Lip Spring Rotary Shaft Grease Seal
It earns its place because it is a TC-style radial shaft seal with a 15mm inside diameter, 25mm outside diameter, and 7mm width. The NBR nitrile body uses a double-lip design with a spring, a configuration meant to hold grease in and keep contaminants away from rotating shafts. It suits gearboxes, hydraulic systems, engines, and industrial machinery.
The flip side: you're getting one specific oil seal in one exact size. The 15X25X7 dimensions need to line up with your shaft and housing before you order.
Mr. O-Ring AS568 010 Black Viton O-Rings, 75 Durometer, 125 Pack
The appeal here is quantity: one 125-count pack of AS568-010 black Viton (FKM) O-rings with a 75 Shore A durometer, manufactured to standard AS568 dimensions. That makes this a useful stock-up option for repairs where chemical, oil, and high-temperature resistance matter.
The limitation is the single size and single compound. All 125 rings are the same AS568-010 dash size and same 75-durometer material, so this is a dedicated one-size inventory rather than a mixed O-ring assortment.
Final Recommendation by Use Case
- Water pump or submersible pump with a 10mm internal diameter: Zaplyte 2 Pcs 10mm Internal Diameter Industrial Mechanical Seal for Water Pump at USD 14.59.
- Case Industrial 580K/580SK/580SL backhoe dipper cylinder: Backhoe Dipper Hydraulic Cylinder Seal Kit at USD 35.00.
- Rotary shaft where a 15X25X7 mm TC seal fits: JSB TC Oil Seal 15X25X7 mm at USD 7.80.
- AS568-010 O-ring stock: Mr. O-Ring AS568 010 Viton 125-Pack at USD 9.99.
