Valve Repair kit for A7 & B7 Leafield Marine Valves, for Avon Inflatables

Leafield Marine


Part Number: IBS501005

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Due to the current "LOCKDOWN" situation imposed tonight 23rd March 2020 at 20:30, we are experiencing delays with the processing of orders and subsequent shipping.

Whilst we have tried our best to continue in a business as usual, the time has come when we must close our showroom doors temporarily to support the Governments Delay Strategy.

If you do place an order with us, we will be shipping items from our warehouses, but it may be subject to a delay.

Should you wish to speak to a member of our team, please call us on 02087884587 and Choose Option 1. Alternatively, please email

This is the repair kit for the inside of the air valve on most Avon Inflatables and Ribs. These valves were fitted to nearly all Avons but also used by other boat manufacturers 

After a few years of faithful service, the rubber diaphragm on a RIB/Inflatable Boat Leafield Marine A7 or B7 inflation valve can fail as either the rubber material becomes brittle and fails to ‘seat’ properly within the inflation valve, or the spring or plastic diaphragm spindle can fail. Replacing the Leafield Marine A7 or B7 inflation valve diaphragm is a straightforward job.

To service your  A7 or B7 valve, you will need:

  • The A7/B7 service kit, which contains a new valve spindle, spring and rubber diaphragm (1 kit per valve) 
  • For A7 - a socket or large pair of grips + cloth to cover wrench jaws and clean components
  • For B7 - a valve wrench spanner
  • Some Cotton Thread
  • Pair of long nosed pliers
  • A small length of masking tape

Refer to diagram below of the valve assembly to familiarise yourself with the inflation valve and its components, before you start the job.

  1. Lock the valve spindle in the open position by pushing-in and twisting anti- clockwise the valve spindle to deflate the inflatable boat collar or tube.
  2. Keep the tube as flat as possible to avoid losing the valve part inside the tube from getting lost. It can be very difficult to retrieve if it falls inside the tube.
  3. Maintain a grip on the inner valve assembly through the inflatable collar or tube fabric to ensure that the inner assembly does not fall loose inside the tube. Unscrewing anti-clockwise remove the nut/outer valve assembly from the inner assembly (plus washer on the A7). For A7 - use a socket/spanner or a large pair of grips (use a cloth to cover the jaws of the grips to prevent damage to the plastic valve). For B7 - use a B7 spanner wrench. Tie some strong cotton thread or string around the screw thread of the inner valve assembly and secure the other end of the string whilst you dismantle the valve. Put a piece of masking tape over the depressed spindle to stop it falling into the tube later. Whilst continuing to grip the inner valve assembly through the inflatable tube fabric, push the inner part of the valve inside the tube and carefully rotate the inflation valve around so you now see the rear of the inner-valve assembly through the valve aperture in the inflatable collar or tube wall.
  4. You can now unscrew the black rubber cup diaphragm from the spindle by using a pair of long nosed pliers to grip the rubber diaphragm and unscrewing it anti-clockwise. Once the diaphragm has been unscrewed the inflation valve can be turned around again. Remove the masking tape and the old spindle and spring. Ensure all surfaces and valve components are clean and free from dirt or objects that could prevent the valve from sealing once re-assembled.
  5. Insert the new spindle and spring into the valve, push and turn to lock the spindle in the open position and put a second piece of masking tape over the valve opening to prevent the spindle from falling out. Once again carefully turn the inflatable boat valve around within the inflatable collar or tube so that you can see the rear of the valve assembly, screw the new black rubber diaphragm onto the spindle – finger tight only. Do not use any tools or you may break the spindle.
  6. Take care not to cross thread or damage the new cup diaphragm.
  7. Carefully turn the inner valve assembly back round once again and pull the thread of the inflation valve body back through the aperture in the tube wall. Remove the masking tape and screw back on the nut/outer-valve assembly.
  8. Inflate the tube and check the valve is airtight.


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Please see below our shipping rates, while we endeavour to keep them correct, may from time to time, they may come up too expensive on smaller items, in this case, please contact us and we will try and find a more competitive rate for you.

Priority Shipping - Mainland GB Only
Economy Shipping  - Mainland GB Only
Highlands and Islands Economy Service - 2kg to 5kg
Highlands and Islands Economy Service - 5kg to 10kg
Highlands and Islands Economy Service - 10kg to 20kg
Oversize Parcels will require a specific shipping quote. 

We also offer calculated shipping Worldwide using UPS. For more information, please follow the checkout process with your selected items.


Last Updated: 20/03/2020

Our returns policy lasts 30 days. If 30 days have gone by since your purchase, unfortunately we can’t offer you a refund or exchange.

To be eligible for a return, your item must be unused and in the same condition that you received it. It must also be in the original packaging.

To complete your return, we require a receipt or proof of purchase.

Please do not send your purchase back to the manufacturer.

To read our full returns and exchanges policy, please click here.


Some items we sell may from time to time be subject to Age Restrictions imposed under UK Law. 

Where this affects your purchase, you will be contacted by a member of our sales team, you will be required to provide us with a copy of photographic identification, from the list below.  A valid photographic ID will also need to be shown to the driver on delivery, along with a signature.

By sharing your ID, you are helping us to ensure items that are intended for people over 18 end up in the right hands. Due to the importance of verifying age when delivering these products, age restricted items can only be delivered to the customer’s address, they cannot be delivered to a neighbour’s address or left in a safe place. In addition, they can’t be delivered to a locker or Pickup Point.

If an adult over the age 18 is not available at the address, or if an adult has not been able to show valid photo identification, the item will be returned by our couriers for re-delivery the following day. If your order is being delivered to a commercial address or residential apartment block, the receptionist, concierge or mailroom attendant receiving your parcel will need to provide a valid ID, showing they are aged 18 or over.

If they can’t, the parcel will be returned to our couriers for re-delivery the following day.

List of acceptable photo identification:

  • A passport
  • A European Union (photo card) driving licence
  • Ministry of Defence Form 90 (a defence identity card issued to serving military)
  • National Identity card issued by European Union Member State (other than the United Kingdom), and Norway, Iceland, Liechtenstein or Switzerland
  • A biometric immigration document (issued by The Home Office to individuals going through different stages of the immigration process as a residence permit.).
  • A photographic identity card bearing a national Proof of Age Standard Scheme (PASS) hologram

All information we receive about customers is treated in accordance with our Privacy Notice, which can be found on our website.

Thank you for your understanding as we do our part in ensuring compliance with UK Law.

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