Due to a temporary system outage at the BRP warehouses, Evinrude, Johnson, and OMC products that are not in stock will ship with additional delays. We apologize for any inconvenience.
Yamaha, Suzuki, Mercury and Mercruiser products will continue to ship without interruption.
Contact Us
My Account
Search Over 1 Million OEM Parts
Most parts in stock- Same day fulfillment

Select your engine to find guaranteed-fit parts:

Drain Screw Kit 10-79953Q04

Satisfaction rating 5 out of 5 (96 Ratings)
$6.95
You save $0.25. (3%) $7.2
5+ IN STOCK
Ships Immediately
Mercury logo Parts included in this kit

Product Description

Mercury factory part. Search for more factory parts & parts diagrams.

Parts included in this kit

Please note: Some of the included items may not be available for purchase separately and won't be listed here.

Product Questions

There are no questions for this product. Ask a new question and receive an answer, directly from our support staff.

96 Product Reviews

25 hp Mercury 2 stroke

Repair Difficulty
Easy
Repair Time
Less than 30 mins
Very good and their customer service is excellent.
by

Problem fixed: Water pump

Pulled lower unit replaced impeller.

Mercury 150

Awesome!!
by

Mercury 9.8 EL

These folks have a great site to order the parts you need and ship fast.
by

Perfect - they have the diagram, I pick the part, click on it, they always ship the right parts. The prices are good. I always get my order is just a few days. Nothing but good things to say. Keep up the good work. SJB
by

by

Mercury 75 HP 1999

Repair Difficulty
Easy
Repair Time
Less than 30 mins
Very good experience. Got what I needed in a timely manner at a good price.
by

Problem fixed: Worn Vent Plug

The old vent plug on my motor had the screwdriver slot worn out. This new plug had a sharp slot for the screwdriver along with a new plastic washer to make sure it seals and doesn't leak water internally.

I like getting the information I need from the parts diagrams . My projects are vintage…
by

I downloaded the Crawley Marine App and set up my garage. Fairly easy to do. Although, the recent orders tab in non-functional. I believe it also limits what products you can see and purchase, as opposed to the Online Store. Besides those little issues, great shipping and status updates.
by

1988 Mercury 9.9 hp

Repair Difficulty
Easy
Repair Time
Less than 30 mins
quick and fast shipping response from Crowley Marine. Great communications
by

Problem fixed: Rebuilt carb gasket leak

take off old carb and replace gasket and she runs great now.

Merc 25hp

Good experience. Delivery took a long time. Makes it hard when waiting for parts
by

Sites great. Easily look up parts with serial numbers and if you have and old outboard like mine it even gives you the newer version/serial of the parts.
by

Force 85hp

Repair Difficulty
Medium
Repair Time
1 to 2 hours
I appreciate the folks that work there. I’ve had a few issues with shipping but they made it right. Parts received are perfect and work well for my old Force outboard.
by

Problem fixed: Lower unit prop shaft needle bearings and seal

Pulled bearing carrier, removed old needle bearings and seal and pressed new ones in. Replaced bearing carrier.

by

by

by

part arrived very fast. easy to order.
by

Had what I needed for an old blue band 80hp merc. Supplied the parts in a timely manner with over all great service!!!
by

by

Mercury sport. Jet XR2

Perfect Support easy Quick delivery
by

Lots choice of parts. Ease of finding the parts. Quick delivery. Thank you !
by

Mariner 150

These guys had everything I needed to get my 1986 Mariner 150 back in the water. Shipping was dead on with in the time listed even with parts having to be ordered from the manufacturer. Will definitely be doing business again soon.
by

Fast delivery and right parts
by

by

120 force

Good experience as expected and on time
by

One part I ordered was out of stock. Crowley staff acknowledged the issue, kept me informed and fulfilled the order as soon as the part was available.
by

by

by

by

Mercury 40 hp

by

Always good experience ordering from Crowley Marine. Thanks.
by

Great!
by

Very prompt
by

I'm glad they had the parts. The shipping was slower than expected.
by

Quick shipping.
by

Perfect!
by

by

by

Great good prices quick shipping
by

Excellent. Fast shipping and correct order. Will definitely be doing more business with Crowley Marine in the future.
by

by

by

by

I'm quite satisfied with Crowley Marine, the website is easy to use to find quality OEM parts. Everything came in as ordered and fit perfectly. I will definitely buy from them again.
by

by

As always these guys are the best very helpful and ready to answer questions. I had a wrong part shipped with this order called no problem got the right one out the same day I had it 2 days later. The web site is very easy to look up parts any questions you can verify with them before ordering
by

I ordered from Canada. Service was terrific. Everything arrived as expected and communication from Crowley during the process was terrific.
by

Really good
by

Overall this was a positive experience. The parts arrived in a reasonable amount of time and are what I expected.
by

2015 Mercury 60 HP 4 stroke EFI

Repair Difficulty
Easy
Repair Time
1 to 2 hours
Excellent. OEM replacements are best. Great prices with flat shipping.
by

Problem fixed: Motor and lower unit oil changes

1. Run motor/lower unit in gear to warm up lower unit. 2. Drain lower unit oil. 3. Replace lower unit drain gaskets (3) 4. Install hand pump and pump new oil in lower unit until oil comes out of upper hole. 5. Plug upper hole. 6. Pump new oil in lower unit until oil comes out of other upper hole. 7. Plug other upper hole. 8. Remove pump for lower drain hole and install plug. 9. Run motor in gear. Allow engine to warm up. Ensure no leaks in lower unit drain bolts. 10. Remove engine oil drain bolt and allow oil to drain. 11. Install lower drain bolt hand tight. 12. Place rag and Mercury oil catcher dish under oil filter. 13. Remove oil filter using oil filter wrench. 14. Remove rag and oil catcher dish 14. Rub new oil on new oil filter gasket and install new oil filter hand tight 15. Remove drain bolt and let remaining oil drain 16. Install new drain bolt gasket. Rub oil on both sides of gasket before installing on bolt. 17. Install drain bolt. Torque to 17.5ft-lbs. 19. Add oil to engine. 19. Run motor. Ensure no leaks at oil filter or drain bolt.

Great people.
by

Great just what I ordered and good delivery
by

I regularly purchase parts from Crowley. They generally have parts in stock, shipping is quick, and prices are among the best.
by

Mercury 65 HP

Repair Difficulty
Easy
Repair Time
Less than 30 mins
Good service. Parts were in stock at reasonable prices.
by

Problem fixed: Old lower unit lube screw slots were bad.

Replaced screws.

by

by

Very good.... Had a problem with shipping, but they took care of it and I received what I ordered... Very nice people do deal with.... Will buy all my boat parts from them when I need good service... Thanks again....
by

80 mercury

Repair Difficulty
Easy
Repair Time
Less than 30 mins
Exactly what was described Was delivered. And in a very timely manner. Very pleased
by

Problem fixed: Lower unit

Just replace old bottom end plugs.

by

1982 50 hp Mercury

Repair Difficulty
Easy
Repair Time
Less than 30 mins
Great
by

Problem fixed: Replaces screws, vent and filler

Just replaced the lower units screw plugs

Excellent! Received good information from the sales tech and the parts arrived quickly.
by

by

good always get the parts I need
by

Mercury 75hp

Repair Difficulty
Easy
Repair Time
Less than 30 mins
Fast shipping, exactly the parts I needed
by

Problem fixed: Water in lower unit.

Gasket on full hole was in pieces. New screw and gasket fixed it right up.

2000 pro max

Repair Difficulty
Medium
Repair Time
2 to 4 hours
Excellent
by

Problem fixed: Lower unit rebuild

Made one cle out of several

by

FAST PROCESSING AND SHIPPING
by

by

by

Very good, very easy and quick delivery
by

Wery good service.
by

Fast & accurate.
by

Mercury 8 HP

My parts were shipped in good time and the price was right. Some of my parts were on backorder but it was only for a couple of days extra, and Crowley kept me informed the whole time.
by

by

Very good
by

Being a regular client is enough proof that my experience is wonderful except one when you couldn't help me through, but life is always ups and downs by nature ;) so keep up the good work.
by

‘88 Merc 25

Repair Difficulty
Easy
Repair Time
Less than 30 mins
Wasn’t a big order but got huge service. Got my old outboard running as new! Thank you Crowley Marine.
by

Problem fixed: Lower unit getting water mixed with oil

Received upper and lower drain plugs with O-Rings and solved problem.

excellant
by

GOOD
by

Merc 115 and 9.9

Parts were correct and on time. Thanks
by

by

Very happy that parts shipped quickly. I received the exact parts that I needed. I have ordered from this store in the past. I will continue to shop this store in the future.
by

by

Great service and fast shipping. Will be using for all my marine parts.
by

1990 Mercury 25 HP

Repair Difficulty
Medium
Repair Time
30 to 60 mins
Needed some parts for a 1990 25hp Mercury outboard. All of the parts were in stock and delivered a day early. They were also less expensive than the local Mercury dealer. I would definitely recommend Crowley to my boating friends.
by

Problem fixed: Priming Assembly Broken

Bought a 1993 Carolina Skiff with a 1990 Mercury outboard. Bought it for the boat, the motor wouldn’t run. I planned on buying another motor, but decided to see if I could get the old Merc going. I fixed some minor issues, tuned it up and changed the lower unit lubricant. Runs great.

by

by

by

mercury 200 hp

Repair Difficulty
Easy
Repair Time
Less than 30 mins
excellent!!!!!!!!
by

Problem fixed: lower unit screw leaking

screws came in fast from Crowley Marine was just what i needed to stop leaking on lower unit.

Repair Difficulty
Medium
Repair Time
1 to 2 hours
on time and on price....happy with it overall
by

1989 25 hp mercury

Repair Difficulty
Hard
Repair Time
More than 4 hours
Replaced seals and bearings in 25hp merc. Ordered parts and shipped to my door (Goulburn NSW) in about 8 days. Thank you!
by

Problem fixed: Water in lower unit

Dismantled gearbox. Made up a puller to remove driveshaft needle bearings. Took some doing removing bearings off reverse gear. Press all parts together with vice and reassemble. Moved at a slow pace and all seems ok

mercury 60hp

Repair Difficulty
Easy
Repair Time
Less than 30 mins
Parts arrived quickly with no problems.
by

Problem fixed: leaks

Needed replacement bolts for vent hole and fill hole.

Mercury 115HP 2 Stroke

Repair Difficulty
Medium
Repair Time
1 to 2 hours
Good website, With good parts diagrams and part numbers. Competitive prices and fast shipping to Australia. Will buy from Crowley Marine again.
by

Problem fixed: Water in gear oil

Drained gear case, Pulled of prop, Removed gearbox, removed water pump housing & Pressure tested gear case to 10PSI and checked for leaks using soapy water and found gear shift seal and prop shaft seal leaking. Removed gear shaft coupling, replaced o-ring and oil seal, Re-installed gear shift coupling. Removed bearing carrier using removal tool, Changed inner and outer seals & outer O-ring, Re-installed bearing carrier lining up prop shaft & gears. Pressure tested gear box and gear box held 10PSI with no signs of leaks, Re-installed water pump housing, Installed lower unit, Installed Prop, Filled gear case with oil. Ran on muffs, tested for water pressure/temp and selected gears.

8hp Mariner

Repair Difficulty
Medium
Repair Time
30 to 60 mins
Top shelf. Excellent Service, and competitive pricing.
by

Problem fixed: Replace impeller

Just slip the lower unit down. Remove old impeller and replace with a new one. Resecure the lower unit.

Jet Boat Sea Ray 120hp

Repair Difficulty
Easy
Repair Time
More than 4 hours
Excellent.
by

Problem fixed: Drive unit not working

Disassembled drive and repaired.

2001 Mercury Outboard 40 HP ELPTO

Repair Difficulty
Easy
Repair Time
Less than 30 mins
Great selection of parts, great service. No problems. The parts schematic are great to locate the correct part you need.
by

Problem fixed: Lower unit fill plugs leaking around gasket.

Easy fix, drain lower unit, put new screws from Crowley in. Problem solved!

force 120 '92

Repair Difficulty
Easy
Repair Time
Less than 30 mins
I like you guys. My boat friends use you too
by

Problem fixed: bad rectifier

Replaced

Product Fitment Grid

This guide is to be used as a reference only. You must verify fitment using your model or serial number.