Cylinder Block Drain Tap 1/4" NPT 22-16951A1 18-4218 for MerCruiser Volvo Penta OMC
Cylinder Block Drain Tap 1/4" NPT 22-16951A1 18-4218 for MerCruiser Volvo Penta OMC
Product Overview
Cylinder block drain tap and plug for marine inboard and sterndrive engines, 1/4 in NPT thread, supplied as 1 x tap. It replaces MerCruiser 22-16951A1, 22-16951Q1, 22-16951T1, 22-64426 and 22-87238, Volvo Penta 82745 and 82745-1, OMC 379957, Sierra 18-4218, Mallory 9-41201 and GLM 13993. The tap lets you drain the block for winterising or after a raw-water flush; a seized or weeping tap is the usual reason a block will not drain or keeps losing coolant.
Specifications & Attributes
| Specification | Detail |
|---|---|
| Condition | New / New with tags |
| Type | Cylinder Block Drain Tap |
| Thread | 1/4 in NPT |
| Application | Block drain, winterising |
| Warranty | Standard |
OEM Cross Reference
| Brand | OEM Part Numbers |
|---|---|
| MerCruiser | 22-16951A1, 22-16951Q1, 22-16951T1, 22-64426, 22-87238 |
| Volvo Penta | 82745, 82745-1 |
| OMC / Evinrude Johnson / BRP | 379957 |
| Sierra | 18-4218 |
| Mallory | 9-41201 |
| GLM | 13993 |
Compatible Engines
Fits the following marine engine families:
| Brand | Engine Type | Application |
|---|---|---|
| MerCruiser | Sterndrive | Block drain |
| Volvo Penta | Sterndrive and inboard | Block drain |
| OMC / Evinrude Johnson | Sterndrive and inboard | Block drain |
What's Included
| Component | Qty |
|---|---|
| Cylinder Block Drain Tap | 1 |
Condition & Warranty
| Item | Detail |
|---|---|
| Condition | New / New with tags |
| Warranty | Standard |
| Packaging | Sealed retail packaging |
Before You Buy
- Verify your engine model and the thread in your block before ordering
- This is 1/4 in NPT — check the drain port size on your engine
- Clear the drain hole before fitting; sediment is the usual cause of a blocked drain
- Use thread sealant on the NPT thread, not on the tap mechanism
- 30-Day Easy Returns
- Free Worldwide Shipping
- OEM Quality Without the Markup
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Boat Owners' Review
Before You Buy
Frequently Asked Questions
What is your refund policy?
We offer a 14-day hassle-free return on all products. Items must be unused and in original packaging. Every XRmarine part is also covered by our 1-year warranty against manufacturing defects. If something is not right, email us at info@xrmarineparts.com — replacement or full refund, your choice.
See our full Refund Policy for complete details.
How does shipping work?
Free international shipping on every order — no minimums. We operate a global warehouse network with a main distribution centre in Asia (10-20 business days). We also hold stock in regional warehouses across the United States, Germany, the United Kingdom, Australia, and Poland (opening soon) — most orders arrive in 1-3 business days within those countries and in 2-8 business days to nearby regions. Tracking included.
See our full Shipping Policy.
How do you keep prices fair?
We cut out the middlemen. XRmarine sources directly from quality manufacturers and sells at honest prices. Same OEM-quality parts, no dealership markup. Every order comes with free shipping, real expert support, and a 1-year warranty.
Learn more on our About Us page.
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We currently accept PayPal — a fast, secure way to pay online. Credit card payments (Visa, Mastercard, American Express) and Shopify Payments are being set up and will be available soon. We appreciate your patience.