When a leak starts, the urgency is real. But in the seals gaskets o rings category, the challenge is choosing between two very different repair kits. One is a 25-count stash of standard AS568-235 Buna-N O-rings. The other is a two-piece mechanical seal designed specifically for water pumps. Both are new, but they solve different problems: static rubber sealing versus rotating-shaft sealing. Here's how to match each kit to the job.
Quick verdict: If you want a flexible supply of rubber seals for hydraulic, pneumatic, automotive, fuel, or oil lines, the AS568-235 Buna 70 Duro O-Ring Set is the more versatile buy. If you are servicing a water pump, submersible pump, or similar rotating-shaft equipment, the 2 Pcs 10mm Internal Diameter Industrial Mechanical Seal is the purpose-built fix.
Here's a side-by-side look at the listed details:
| Product | Listed Price | Price Bar | What You Get | Best For |
|---|---|---|---|---|
| AS568-235 Buna 70 Duro O-Ring Set Qty 25 | USD 20.00 | 25 nitrile O-rings, 70 durometer, standard AS568-235 size | Hydraulic, pneumatic, industrial, automotive, fuel, oil sealing | |
| 2 Pcs 10mm Internal Diameter Industrial Mechanical Seal for Water Pump | USD 14.59 | 2 mechanical seals, 10mm internal diameter, carbon, rubber, and metal | Water pumps, submersible pumps, effluent plants, refrigeration, AC |
Where the AS568-235 O-Ring Set Wins
Versatility and stored supply. You get a full package of identical O-rings in one standard size, which makes it easy to keep spares for multiple repairs. The 70 durometer hardness is a common middle-ground firmness for general sealing, and Buna-N is well suited to oil, fuel, and hydraulic fluids. This set covers a wide range of static sealing tasks across industrial and automotive equipment.
Where the 10mm Mechanical Seal Wins
Pump-specific fit. Designed with a single coil spring and rubber bellows, this seal is built to handle the rotating shaft of a water pump. The carbon, rubber, and metal construction supports applications like submersible pumps, effluent plants, refrigeration, and air conditioning. It includes two seals, so you have a backup for the next pump job.
AS568-235 Buna 70 Duro O-Ring Set Qty 25 Hydraulic Industrial Seals NOS
Start here if you want a ready stash of one common O-ring size. The package holds 25 Buna-N (nitrile) O-rings with a 70 durometer hardness, which is a widely used firmness for general hydraulic, pneumatic, automotive, fuel, and oil sealing jobs. Because the size follows the AS568-235 standard, the dimensions match a recognized industrial convention, so it is easier to tell whether these will suit your existing gland. The main limitation is scope: these O-rings are meant for static or lightly moving rubber seals, not for a rotating pump shaft. The set is also the higher-priced item at USD 20.00, so the value comes from having 25 matched rings instead of a single spare. If your equipment needs that specific size, this kit gives you a long-term supply.
2 Pcs 10mm Internal Diameter Industrial Mechanical Seal for Water Pump
For water pump repairs, this is the seal style built for rotating shafts. Each of the two mechanical seals uses a single coil spring and rubber bellows, with carbon, rubber, and metal construction, a common design for pump shaft sealing. The 10mm internal diameter and 22 x 29mm dimensions are specific to a compact pump seal pocket, and the package includes two units, so you can keep a backup. The clear limitation is that it is not a general-purpose seal kit: it will not work as an O-ring for static fittings or line connections. The listing also carries a California Prop 65 warning about cancer and reproductive harm, which is worth knowing before you handle the parts.
Final Choice by Use Case
- Pick the AS568-235 Buna 70 Duro O-Ring Set when you need a supply of standard-size rubber seals for hydraulic lines, pneumatic fittings, automotive connections, fuel systems, or oil sealing. The price difference is laid out in the table above, and the set is the stronger match for general static sealing.
- Pick the 2 Pcs 10mm Internal Diameter Industrial Mechanical Seal for Water Pump when you are repairing a water pump, submersible pump, effluent plant, refrigeration unit, or air conditioner. The table shows the price difference, and the seal is the more focused choice for a rotating shaft.
