Part# 05-26740
MFR Model# A30-LR
SeriesDescriptionPart No.
A30LRAero 300 Lock Fuel Cap w/Rivet Flange05-26740


These English fuel caps are used on most of the worlds super cars and bikes, and some series production aero planes. They are beautifully made in forged and bright anodized aluminum. The high precision and easy to operate mechanism is very secure and non vented. They are designed to keep the fuel in and the water out. The lock is there to ensure that your tank is free from contaminants. Aero caps are used on Adam, CAP, Cirrus, Diamond, Lancair Columbia, Lancair kits, Nemesis, Vans, Velocity and many more aircraft.

Cap assemblies come complete with cap, gasket, and flanges as ordered. Two keys come with the locking version. Fixing can be by rivet, bolt, weld or glass in as appropriate. These are flush caps of outstanding quality which are ideal for virtually any homebuilt aircraft.
Order the attach ring separately as needed, see accessories.

The 300 Series: 3-3/4" OD opening 1-3/4", 6 hole 3" pcd. A37 fits 2" and 2.25" Hoses.

The A512 & A508 Series: 3" entry / 5.5" OD. Feature special surface seal to avoid water/ice ingress. For Avtur Jet and diesel fuels.
California Prop 65 Warning Symbol

WARNING: Cancer and Reproductive Harm -


As Robert says, all Cirrus gas aircraft use these 300 series fuel caps. Do not understand Jasons problem. Re locks, replacement numbered locks are often available so as to match an older one. Just quote the number required and request a replacement lock. eg 615.....

February 27, 2022

All Cirrus Avgas Aeroplanes have used the Newton 300 series fuel cap since DAY 1

Robert S
October 16, 2020

did not fit.

October 14, 2020

Does not fit a 2002 Cirrus SR22.

October 12, 2020


Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

Q: Could you please tell me the size of the hose neck on Part # 05-28653?

Either 2" or 2-1/2" I.D. hose can be used on the 05-28653 hose neck.

Q: What is the difference between the filler neck of 05-28653 and the hose fitting of 05-28659? Do they come with the back flange and mounting screws?

The only difference is the 05-28653 has a locking cap, and the 05-28659 has a non-locking cap. They do come with mounting hardware (screws & nuts), cork gasket, but not a back flange.

Q: What is the difference between Part #'s 05-28654 and 05-02650?

They are two different size caps. In short, the 05-28654 is a much smaller diameter cap than the 05-02650.

Q: What is the size of the entire ring in the 12 hole set? P/N 05-00045 A512L

This would have a 5.47" Outside Diameter and a 3.27" Inside Diameter.

Q: How much does this Aero Fuel Cap (part # 05-00045) weigh?

The cap itself weighs 0.54 LB. The entire assembly including bolts, keys, gasket, and mounting ring is approx 1 LB.

Q: Is the Aero Fuel Cap pricing per each or per pair?

These caps are priced and sold as each.

Q: Does this have FAA approval?

No, this is an experimental part.

Q: What is the weight of the 05-28651 cap?

Approx 0.5 lbs.

Q: Could you please tell me the size of the hose neck on Part # 05-28651?

2.5 inch

Q: What are the dimensions of part # 05-28653?

Flange Diameter 3-11/16
length : 2 inch
O.D of the large flange 2-1/4
Smaller Flange: 2 inch

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