Easy
15-30 minutes
This replacement ring is an authentic manufacturer sourced item. It is custom designed for use with Craftsman air compressors. It helps to distribute the pressure and heat evenly by creating a tight seal between the cylinder and piston. It is made out of metal and it is sold individually.
To complete this job you will need a screwdriver, wrench set and pliers. Please make sure to unplug the air compressor and the bleed air out from the tank before starting this repair.
Ring DAC-308
OEM part for: Craftsman, DeVilbiss
Part Number: DAC-308
$11.30
In Stock
Ships within 1 business day 
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Product Description ?
- Classification: Part
- Weight: 0.01 lbs.
- Shipping: Ships Worldwide
Frequently Purchased Together ?
Compatibility
This part will fit the following 58 machines
Craftsman
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DeVilbiss
5Z598C (Type 1) A 2.0hp 3g Hd Pl 1stg 120 View Diagrams & Manuals
Show More Compatible Models
This item works with the following types of products:
- Compressor Parts
Customer Part Reviews ?
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Great product-worked as required.
Fixed my Craftsman compressor. Thanks.
Guest -
October 16, 2023
Verified Purchase
Old Craftsman compressor parts
Part fit perfectly for an old craftsman compressor
Guest -
July 22, 2023
Verified Purchase
Exact fit
Nice to have a great price and correct item
Guest -
September 6, 2022
Verified Purchase
Fast delivery.
Fit perfectly.
Guest -
March 25, 2022
Verified Purchase
semi-easy repair
after I put the head and cylinder into boiling water, the cylinder came off the head, making assembly easy and saved the head gasket as well. my compressor is making air like a champ once again!
Guest -
January 3, 2022
Verified Purchase
Exact part, perfect fit.
All the parts fit perfect. My 25 year old compressor, lives again.
Guest -
August 3, 2020
Verified Purchase
Perfect!
It got my compressor up and running in no time! Thank you
Guest -
July 4, 2020
Verified Purchase
Easy Repair
part worked great. Compressor working again
Guest -
May 15, 2020
Verified Purchase
Part fitted great!
Part fitted great
Guest -
March 9, 2020
Verified Purchase
Saved me $$$ on a new compressor!
Very satisfied with this order.
Guest -
November 19, 2019
Verified Purchase
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t days ago
Verified Purchase
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Questions & Answers ?
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Does this fit my product?Questions & Answers for Ring
I would like to buy a piston ring and cylinder kit with gaskets and o rings for this compressor.
John
for model number 921.164710
asked on 2022-03-19
Hello John, thank you for writing. The piston Kit part 5140240-52 should have all the parts you are searching for. You can view the kit and parts on our site. If you need help placing an order, customer service is open 7 days a week. Please feel free to give us a call. We look forward to hearing from you.
eReplacementParts Team March 19, 2022
Customer Repair Instructions ?
All our customer repair instructions are solicited directly from other customers just like you who have purchased and replaced this exact part.
Compressor build up time was slow, and would not reach the shut off pressure (compression ring worn out)
Ned - February 22, 2017
👍 11 of 12 people found this instruction helpful
Tool Type
Compressor
Difficulty
Medium
Time
1-2 hours
Tools Used
Screwdriver, Socket set, Adjustable Wrench
Parts Used
1. Remove shroud by prying out of locks on either side.
2. Loosen nut on compressor line at tank valve.
3. Remove nuts and bolts from cylinder-head, and lift off cylinder head.
4. Using an allen wrench loosen cap screw on side of connecting rod.
5. Gently pry out on connecting rod away from bearing.
6. Remove cylinder,piston and connecting rod out the top of unit.
7. Slide piston out of cylinder and use allen wrench to remove head of piston to access compression seal (ring).
8. Replace seal and reinstall piston head (outer lip of seal must face up).
9. Apply a small amount of oil (WD-40) to cylinder for easy installation of piston in cylinder.
10. Push piston into cylinder and lower assembly into housing.
11. Reinstall connecting rod to bearing making sure there is small amount of clearance between rod and counterweight.
12. Install cylinder-head, line and shroud.
2. Loosen nut on compressor line at tank valve.
3. Remove nuts and bolts from cylinder-head, and lift off cylinder head.
4. Using an allen wrench loosen cap screw on side of connecting rod.
5. Gently pry out on connecting rod away from bearing.
6. Remove cylinder,piston and connecting rod out the top of unit.
7. Slide piston out of cylinder and use allen wrench to remove head of piston to access compression seal (ring).
8. Replace seal and reinstall piston head (outer lip of seal must face up).
9. Apply a small amount of oil (WD-40) to cylinder for easy installation of piston in cylinder.
10. Push piston into cylinder and lower assembly into housing.
11. Reinstall connecting rod to bearing making sure there is small amount of clearance between rod and counterweight.
12. Install cylinder-head, line and shroud.
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My compressor would not build over 60 psi
Bill - November 27, 2016
👍 3 of 4 people found this instruction helpful
Tool Type
Compressor
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Socket set
Parts Used
1. Removed top 4 bolts from the head.
2. Used a torx screwdriver to separate the piston head.
3. Replaced ring, reinstalled top of piston, tightened torx screw
4. Replaced head and 4 bolts.
2. Used a torx screwdriver to separate the piston head.
3. Replaced ring, reinstalled top of piston, tightened torx screw
4. Replaced head and 4 bolts.
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Wouldn’t build pressure
David - December 21, 2017
👍 1 of 1 people found this instruction helpful
Tool Type
Compressor
Difficulty
Easy
Time
30-60 minutes
Tools Used
Screwdriver, Socket set, Allen wrench
Parts Used
Removed compressor heads, unscrewed piston to, removed damaged compression rings, installed new rings, put back together in reverse order.
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The compressor pump was completely worn out.
Keith - April 7, 2016
👍 1 of 1 people found this instruction helpful
Tool Type
Compressor
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver, Socket set
It was basic. I removed the plastic cowl. The cowl is held on by two screws. I did this with a flat black screwdriver. The next simple steps was to remove the flywheel fan. One bolt & I used a socket set. After removing the flywheel fan, I demoted the one bolt that retained the rod. There is a pinch bolt that I also loosened. Next was the four bolts which fastened the head. Now it was just a matter of pulling out the old parts & installing the new parts. Very easy & straight forward. Assembly was a reversal of the order. The compressor works much better. It's a lot quieter & takes less time to fill. I'm very happy.
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Piston ring failed
thomas - August 24, 2023
Tool Type
Compressor
Difficulty
Medium
Time
15-30 minutes
Tools Used
Screwdriver, Nutdriver
Parts Used
-Unplugged compressor
-removed shrouds covering motor and compressor
-disconnected air line from compressor head
-removed bolts from compressor head
-removed piston sleeve
-replaced head oring
-unscrewed top of piston to remove old plastic piston ring
-installed new piston ring tightened screw ontop of piston
-reversed steps for reassemble
-removed shrouds covering motor and compressor
-disconnected air line from compressor head
-removed bolts from compressor head
-removed piston sleeve
-replaced head oring
-unscrewed top of piston to remove old plastic piston ring
-installed new piston ring tightened screw ontop of piston
-reversed steps for reassemble
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Torn oring
James - June 24, 2023
Tool Type
Compressor
Difficulty
Medium
Time
15-30 minutes
Tools Used
Socket set, None
Parts Used
Disassembled, replaced, reassembled.
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would'nt build up air
John - May 28, 2023
Tool Type
Compressor
Difficulty
Easy
Time
15-30 minutes
Tools Used
Screwdriver, Socket set, Wrench Set
Parts Used
removed plastic covers.and took cylinder apart.and replaced ring/was wore and got some fine sand paper and sanded sleve down alittlewas rough from ring bad could'nt get a new one cuase
is obsolete. put back together works just fine now builds up air like it should easy fix
is obsolete. put back together works just fine now builds up air like it should easy fix
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Piston ring worn out
Douglas - December 29, 2022
Tool Type
Compressor
Difficulty
Easy
Time
1-2 hours
Tools Used
Screwdriver, Socket set, Wrench Set
Parts Used
Disassemble compressor and removed cylinder and installed new ring.
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Piston ring was woreout
MICHAEL - September 14, 2022
Tool Type
Compressor
Difficulty
Easy
Time
15-30 minutes
Tools Used
Socket set, Wrench Set
Parts Used
Removed top of cylinder
Unbolted rod for piston
Used torqs bit to remove piston and old ring replaced ring and in reverse order put back together
Unbolted rod for piston
Used torqs bit to remove piston and old ring replaced ring and in reverse order put back together
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Poor recharge of air compressor tank
Chuck - July 14, 2021
Tool Type
Compressor
Difficulty
Easy
Time
15-30 minutes
Tools Used
Wrench Set, Nutdriver
Removed head, removed and honed cylinder (replacement cylinder not available), replaced all o rings and compression seal.
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Our customer service team are at the ready daily to answer your part and product questions. We have a dedicated staff with decades of collective experience in helping customers just like you purchase parts to repair their products.
All our part reviews are solicited directly from other customers who have purchased this exact part. While we moderate these reviews for profanity, offensive language or personally identifiable information, these reviews are posted exactly as submitted and no alterations are made by our team.
All our customer repair instructions are solicited directly from other customers just like you who have purchased and replaced this exact part. While we moderate these reviews for profanity, offensive language or personally identifiable information, these reviews are posted exactly as submitted and no alterations are made by our team.
Based on data from past customer purchasing behaviors, these parts are most commonly purchased together along with the part you are viewing. These parts may be necessary or helpful to replace to complete your current repair.
All our installation videos are created and produced in collaboration with our in-house repair technician, Mark Sodja, who has helped millions of eReplacementParts customers over the last 13 years repair their products. Mark has years of experience in selling and repairing both commercial and residential products with a specialty in gas-powered equipment.
This data is collected from customers who submitted a repair instruction after replacing this exact part. Customers can rate how easy the repair was to complete and how long it took. We aggregate this data to provide a repair rating that allows customers to quickly determine the difficulty and time needed to perform their own repair.
