Choosing the wrong thru-hull fitting can turn a simple drain line project into a headache. Alastin's marine drain connectors come in two sizes, and the one you need depends on the diameter your boat's plumbing calls for.
Quick Verdict
The right choice comes down to the diameter of your drain connection. Pick the fitting that matches your boat's plumbing size, not a brand advantage-both are Alastin 316 stainless steel fittings.
Price & Attribute Comparison
| Feature | 3/4" Alastin Thru-Hull Fitting | 1/2" Alastin Thru-Hull Fitting |
|---|---|---|
| Price | USD 34.13 | USD 25.97 |
| Price bar | ||
| Size | 3/4" | 1/2" |
| Manufacturer Part Number | ALS1103A | ALS1102A |
| Brand | Alastin | Alastin |
| Material | Stainless Steel | Stainless Steel |
| Condition | New | New |
| Part Type | Hatch | Hatch |
Both fittings share the same brand, material, condition, and part type. The meaningful differences are the connection size and the price.
Where Each Fitting Wins
The 3/4" fitting wins for large-diameter installations. The 1/2" fitting wins for small-diameter installations.
Product Notes
3/4" Alastin 316 Stainless Steel Thru-Hull Fitting
This larger-diameter marine drain connector is built from 316 stainless steel and comes as a new hatch-type fitting, manufacturer part number ALS1103A. If the rest of your boat's plumbing is sized for a larger opening, this fitting matches that diameter. The tradeoff is the higher listed price compared to the smaller version. It's also intended for use across a range of yacht types, including sailing, fiberglass, inflatable, and commercial yachts, but your primary decision should remain the required connection size.
1/2" Alastin 316 Stainless Steel Thru-Hull Fitting
This smaller-diameter marine drain connector also uses 316 stainless steel and is a new hatch-type fitting, manufacturer part number ALS1102A. If your existing drain line calls for a smaller thru-hull connection, this fitting answers that need. The limitation is simply its size: it is built for a smaller opening, so it will not serve a large-diameter plumbing setup. Like the larger fitting, it is intended for installation on a variety of yachts, including sailing, fiberglass, and commercial vessels.
Final Choice by Use Case
Pick the 3/4" Alastin Boat Thru-Hull Plumbing Fitting 316 Stainless Steel Marine Drain Connector when your project centers on a 3/4-inch drain line. Its $34.13 price is the higher of the two, but you are getting the larger size, not any extra features.
Pick the 1/2" Alastin Boat Thru-Hull Plumbing Fitting 316 Stainless Steel Marine Drain Connector when the connection you need is 1/2-inch. At $25.97, it is the lower-priced pick of the pair while still using the same type of stainless steel material. The choice comes down to the diameter of your plumbing.
