Choosing a marine thru-hull drain connector starts with matching the fitting to your boat's hull opening. The decision here is between two Alastin 316 stainless steel options: the 3/4" Boat Thru-Hull Plumbing Fitting 316 Stainless Steel Marine Drain Connector listed at USD 34.13 and the 1/2" Boat Thru-Hull Plumbing Fitting 316 Stainless Steel Marine Drain Connector listed at USD 25.97. Both are New, made in China, and share a Hatch part type, so the meaningful choice is the fitting size your hull needs and the listed price you'll pay.
Quick Verdict
Both connectors are 316 stainless steel, New, and built for yacht drain systems. No inherent advantage stands out between them; the size is the decisive factor. For a 3/4-inch thru-hull port, choose the larger connector; for a 1/2-inch port, choose the smaller connector.
Comparison at a Glance
| Feature | 3/4" Alastin Thru-Hull Drain Connector | 1/2" Alastin Thru-Hull Drain Connector |
|---|---|---|
| Listed price | USD 34.13 | USD 25.97 |
| Price bar | ||
| Fitting size | 3/4" | 1/2" |
| Part number | ALS1103A | ALS1102A |
| Material | Stainless Steel | Stainless Steel |
| Condition | New | New |
| Country of Origin | China | China |
| Part Type | Hatch | Hatch |
Where Each Product Wins
- The 3/4" Alastin Thru-Hull Drain Connector is the larger of the pair, so it's the winner when your boat requires the bigger thru-hull opening.
- The 1/2" Alastin Thru-Hull Drain Connector is the smaller of the pair, and it's the winner when your boat needs the smaller opening.
Product Notes
3/4" Alastin Thru-Hull Drain Connector
This larger connector is sized for boats whose thru-hull ports accept 3/4-inch fittings. It uses 316 stainless steel, the same material as the smaller model, and comes in New condition with China origin. The part number ALS1103A helps identify it, and its Hatch part type is shared across the pair. If your hull opening is actually 1/2 inch, this larger fitting won't match, so measure the opening before you buy. With the 3/4-inch bore, this is the only option in this pair that directly targets 3/4-inch thru-hull plumbing.
1/2" Alastin Thru-Hull Drain Connector
The smaller connector is sized for boats whose thru-hull ports accept 1/2-inch fittings. It shares the same 316 stainless steel construction, New condition, and China origin as the larger model. Its part number is ALS1102A, and it also has the Hatch part type. The limitation is the reverse of the larger model: it won't fit a 3/4-inch opening, so it's only the right pick for a 1/2-inch port. If your boat uses a 1/2-inch drain opening, this is the matching Alastin connector in the pair.
Final Choice by Use Case
- For a 3/4-inch thru-hull port, go with the 3/4" Alastin Thru-Hull Drain Connector.
- For a 1/2-inch thru-hull port, go with the 1/2" Alastin Thru-Hull Drain Connector.
- The USD 8.16 price difference between the two listed prices is simply part of the size choice, not a quality signal.
