Best Ac O-ring Kit (2026)

A slow refrigerant leak often starts at a flattened O-ring on a compressor fitting or a hose connection. The best ac o-ring kit puts the right size seal in your hand before the job starts, and this guide compares A/C seal kits by piece count, size range, material and use, using only what each listing states.

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Picks for the garage

#	Product	Shop Score	Buy
1	KEZE 595 Pcs Air Conditioning O Ring Kit,36 Size	9.6/10	Buy on Amazon
2	265 Pcs 30 Sizes AC O Ring & Gasket Seal Kit	9.5/10	Buy on Amazon
3	NBRINGO 485 PCS Metric AC O Ring Kit for R134a	9.5/10	Buy on Amazon
4	270PCS 18 Sizes AC O Ring Kit,Oil Resistant Car	9.4/10	Buy on Amazon
5	270 Pcs HNBR AC O Ring Kit	9.4/10	Buy on Amazon

1

KEZE 595 Pcs Air Conditioning O Ring Kit,36 Size

Keze·9.6/10 Shop Score

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The Shop Score runs from 9.2 to 9.8 and weighs performance (35%), build (25%), value (25%), safety (10%, where it applies) and warranty (5%), using only what the manufacturer and the listing publish. How we pick ›

A 595 piece green NBR kit in 36 sizes, metric and imperial, with a labeled storage box, for A/C, compressors and plumbing.

Check price on Amazon

Pros

• 595 rings in 36 sizes, the largest kit here
• Metric and imperial sizes, from 3 by 1 mm to 11/16 by 1/8
• Green NBR at 70 Duro, rated from -40℃ to 120℃
• Sturdy plastic storage box with a label for each size

Cons

• The size list repeats 5/16x5/64 twice
• The guarantee is spelled 'Satisfaction Guantee' in the listing
• No warranty term is stated in the listing
• No refrigerant list is stated, only general A/C use

2

265 Pcs 30 Sizes AC O Ring & Gasket Seal Kit

ZDBB·9.5/10 Shop Score

i

The Shop Score runs from 9.2 to 9.8 and weighs performance (35%), build (25%), value (25%), safety (10%, where it applies) and warranty (5%), using only what the manufacturer and the listing publish. How we pick ›

A 265 piece kit in 30 sizes with O-rings, compressor gaskets, bonded washers and line seals, for R134a automotive A/C systems.

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Pros

• 30 sizes, with O-rings, gaskets, bonded washers and line seals
• Rubber and metal materials with smooth, burr-free edges
• Listed for R134a compressors, condensers, lines and ports
• 30 organized sizes for replacing worn, cracked, flattened or missing seals

Cons

• No storage box is stated in the listing
• No temperature range is stated in the listing
• No warranty term is stated in the listing
• Only 265 pieces, the smallest count here

3

NBRINGO 485 PCS Metric AC O Ring Kit for R134a

NBRINGO·9.5/10 Shop Score

i

The Shop Score runs from 9.2 to 9.8 and weighs performance (35%), build (25%), value (25%), safety (10%, where it applies) and warranty (5%), using only what the manufacturer and the listing publish. How we pick ›

A 485 piece green NBR kit in 18 sizes in a clear plastic case, for R134a, R12, R22 and R404a automotive air conditioning.

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Pros

• 485 rings in 18 sizes, in a clear plastic case with compartments
• Green NBR with resistance to oils and coolants
• Listed for R134a, R12, R22 and R404a refrigerants
• Compartments allow quick identification and easy access

Cons

• Only 18 sizes, against 36 in the Keze kit
• No temperature range is stated in the listing
• No warranty term is stated in the listing
• No gaskets or washers are included, unlike the ZDBB kit

4

270PCS 18 Sizes AC O Ring Kit,Oil Resistant Car

Purthog·9.4/10 Shop Score

i

The Shop Score runs from 9.2 to 9.8 and weighs performance (35%), build (25%), value (25%), safety (10%, where it applies) and warranty (5%), using only what the manufacturer and the listing publish. How we pick ›

A 270 piece NBR kit in 18 sizes in a partitioned box with specification paper, for car A/C compressors and general repair.

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Pros

• 270 rings in 18 sizes for A/C compressor sealing
• NBR that resists oil and holds elasticity and shape
• Partitioned storage box with specification identification paper
• Also listed for household appliances and mechanical repair

Cons

• The warranty field reads 'Warranty Within 3 Mouths', with no clear term
• No temperature range is stated in the listing
• No refrigerant list is stated, only general A/C use
• No gaskets or washers are included, unlike the ZDBB kit

5

270 Pcs HNBR AC O Ring Kit

VPQZUPG·9.4/10 Shop Score

i

The Shop Score runs from 9.2 to 9.8 and weighs performance (35%), build (25%), value (25%), safety (10%, where it applies) and warranty (5%), using only what the manufacturer and the listing publish. How we pick ›

A 270 piece HNBR kit in assorted sizes for automotive A/C repair, plumbing and air and gas connections.

Check price on Amazon

Pros

• HNBR, or hydrogenated nitrile butadiene rubber
• 270 assorted seals for A/C maintenance and repair
• Listed for compressor, hose and A/C line connections
• Also listed for plumbing, air and gas connections

Cons

• The spec table NumberOfItems reads 1 for a 270-piece kit
• No size count is stated in the listing
• No temperature range is stated in the listing
• No warranty term is stated in the listing

Compared on paper

Specs such as CFM, PSI and torque are the manufacturer’s ratings as listed, collected 3 November 2026. Where a listing contradicts itself, both figures are shown.

How the points were given

Each kit is scored on performance, build, value, safety and warranty, with the weights published on our How We Pick page. None of the listings states a UL, ETL or CSA listing, so none earns safety points. None of the 5 listings states a clear warranty term.

Shop Scores range from a low of 9.2 to a high of 9.8, with each tool positioned by its weighted points proportionally, and more points always yields a higher score.

What the listings tell you

We read 5 A/C o-ring kits for this guide. The Purthog warranty field reads “Warranty Within 3 Mouths”, with no clear term. The VPQZUPG spec table counts 1 item for a 270-piece kit. The Keze listing spells its guarantee “Satisfaction Guantee” and the size list repeats 5/16×5/64 twice. Read the title and bullets, not just the spec table.

Buying guide: best ac o-ring kit

Piece count and sizes

Kits here hold 595, 485, 270, 270 and 265 pieces, in 36, 30 and 18 sizes. The Keze kit covers 36 sizes in metric and imperial, from 3 by 1 mm to 22 by 2 mm and from 7/32 by 1/16 to 11/16 by 1/8. The ZDBB kit covers 30 sizes, and the NBRINGO and Purthog kits cover 18 sizes each. The VPQZUPG listing states no size count. Match the old ring before ordering: the ZDBB listing says to confirm the required size and compatibility first.

Material and temperature

3 of the 5 kits use NBR, and 1 uses HNBR. The Keze rings are green NBR at 70 Duro, with a working temperature range from -40℃ to 120℃, and resistance to ozone, oil and heat. The NBRINGO and Purthog rings are NBR, with resistance to oils and coolants. The VPQZUPG rings are HNBR, or hydrogenated nitrile butadiene rubber. The ZDBB kit mixes rubber and metal, with gaskets and bonded washers beside the rings.

Refrigerant compatibility

The NBRINGO kit is listed for R134a, R12, R22 and R404a refrigerants. The ZDBB kit is listed for R134a automotive A/C systems, including compressors, condensers, refrigerant lines, hose connections and port fittings. The Keze kit is listed for air conditioning, compressors, plumbing, hydraulics and auto engines. The Purthog and VPQZUPG kits are listed for car A/C repair and general sealing. Confirm the refrigerant before ordering: the kits are not all listed for the same systems. For leak work, see our best AC leak detector and AC manifold gauge vs recharge kit guides.

Storage and spares

The Keze, NBRINGO and Purthog kits state a storage box: the Keze rings sit in a sturdy plastic storage box with a label for each size, the NBRINGO rings in a clear plastic case with individual compartments, and the Purthog rings in a partitioned box with specification paper. The ZDBB kit adds compressor gaskets, bonded washers, line seals, port seals, condenser seals and hose gaskets. Keep the box shut and the sizes in order, so the next seal is easy to find.

Garage Fit Check

Check these before the first job, using only what the listings state.

• Match the old ring first: compare the replacement O-ring with the original seal, as the VPQZUPG listing advises.
• Confirm the refrigerant: R134a, R12, R22 and R404a are not all listed for every kit.
• Check the size list: the Keze kit covers 36 sizes in metric and imperial, the ZDBB kit 30 sizes.
• Keep the box shut and the sizes in order, so the next seal is easy to find.
• Check the warranty field: the Purthog field reads “Warranty Within 3 Mouths”, with no clear term.

FAQ: garage tools

What size O-ring do I need for my A/C?

Match the old ring: the VPQZUPG listing says to compare the replacement O-ring with the original seal and confirm the required size before installation. The Keze kit covers 36 sizes from 3 by 1 mm to 22 by 2 mm, and the ZDBB kit covers 30 sizes.

Are these O-rings compatible with R134a?

The NBRINGO kit is listed for R134a, R12, R22 and R404a, and the ZDBB kit is listed for R134a automotive A/C systems. The other kits are listed for car A/C repair in general, so confirm the refrigerant first.

What material are A/C O-rings made from?

3 of the 5 kits here use NBR, and 1 uses HNBR. The Keze rings are green NBR at 70 Duro, and the VPQZUPG rings are HNBR, or hydrogenated nitrile butadiene rubber.

How many O-rings come in a kit?

Kits here hold 595, 485, 270, 270 and 265 pieces. The Keze kit holds the most pieces, in 36 sizes.

Do these kits include gaskets as well as O-rings?

Only 1 kit here does: the ZDBB kit includes compressor gaskets, bonded washers, line seals, port seals, condenser seals and hose gaskets beside the O-rings. The other kits are O-rings only.

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