Apeks RK3 Fins

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RRP £118.00
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Free UK Delivery

The Apeks RK3 fin takes it pedigree from the first classic rubber fins sold in the US. Popular among military and professional divers you can confident in its typhoon-proof durability and no-nonsense functionality.

Free UK Delivery

The Apeks RK3 fin takes it pedigree from the first classic rubber fins sold in the US. Popular among military and professional divers you can confident in its typhoon-proof durability and no-nonsense functionality.

Apeks RK3 Fins

The Apeks RK3 fin takes it pedigree from the first classic rubber fins sold in the US. Popular among military and professional divers you can confident in its typhoon-proof durability and no-nonsense functionality.

The RK3’s compact, yet wide design allows you to produce impressive thrust and manoeuvrability. That tough rubber compound means it’ll handle any dive environment, including the coldest waters, anywhere in the world. The blade of the fin is vented, reducing resistance on your upstroke and enhancing thrust on the downstroke, while the blade itself offers just enough flex to reduce leg fatigue.

A reinforced bungee strap on the heel ensures your feet remain comfortable as you descend, compressing down on your dive boot as the water pressure crushes it.

Key Benefits

  • Compact & Wide Fin Shape - The Apeks RK3’s fin shape allow you to generate impressive levels of thrust without compromising on control and manoeuvrability.
  • Ultra-Rugged Design - Made of tough rubber, the RK3 will take on any challenge and survive any dive. It’s no surprise that this fin is loved by military, coast guard and public safety divers through the world.
  • Cold Water Ready - The Apeks Fin robust rubber compound means the RK3 fins are suitable for the most brutal of ice-cold dive environments.
  • Vented Blade Design - The vented blade design helps to reduce leg fatigue and increase thrust. On the upstroke water passes through during the weakest part of the stroke, reducing strain. During your powerful downstroke the vents help channel water away from the blade from maximum power.
  • Bungee Spring Strap - A wide foot pocket design and spring strap makes getting in and out of the foots painless even if you’ve got cold hands or wearing bulky gloves. As water pressure crushes you dive boot during descents the spring automatically cinches down on your boot so you don’t need to adjust the fit at any time once its on.
  • Easy-Storage - Easily store or carry your RK3 Fins with a carabinier by looping it through the large grommet holes at the tip of the fin.

Who is the Apeks RK3 Fin For?

Popular with the military, dive professionals and public safety divers for the decades the Apeks RK3 fin is the perfect choice if you’re looking for an indestructible fin that will do everything you need it to do. Anywhere in the world. Even if you’re a recreational diver the Apeks RK3 will offer you years of dependable diving enjoyment and fun in the sea.

Who are Apeks?

Well known for their design and manufacturing of high quality breathing apparatus, Apeks supply more UK divers with regulators than any other dive manufacturer. Apeks has grown to become one of the benchmarks of the industry with superior standards in both engineering and design. Innovative development of not only their regulators but other diving equipment, Apeks offer a lifetime guarantee on all of their equipment, a testimony to the reliability and quality.

Apeks RK3 Fin Specifications
  Weight (Per Fin) Length  Foot Depth Foot Width



22cm 9cm
Large   1.19kg  54.5cm  25.5cm  9.5cm
Super   1.27kg  57cm  27cm  10cm
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Apeks RK3 Fin Size Chart

  Medium Large Super
Weight  982g 1.1kg 1.27kg
Blade (cm) 49 54.5 57
Foot Depth (cm) 22 25.5 27
Foot Width (cm) 9 9.5 10

Apeks RK3 HD Fins Size Chart

  Medium Large Super
Weight  1.1kg 1.4kg 1.44kg
Blade (cm) 49 54.5 57
Foot Depth (cm) 22 25.5 27
Foot Width (cm) 9 9.5 10

See our full guide to Dive Fins Here

Diving fin buyers guide


We will take every effort to get you goods to you as efficiently and effectively as possible. All orders placed before 3pm will be shipped on the day of ordering subject to payment authorization and item availability.

Any items which are out of stock will be shipped as soon as they become available. If this causes a delay in your delivery, you will be notified and your order dispatched as soon as possible. If any items are unavailable, you will be contacted and offered a replacement or refund.

UK Delivery

If your order total is under £40 then you can choose one of:

  • Royal Mail Tracked - £2.95
    (1-3 Working Days)
  • DPD Next Day - £4.95
    (Guaranteed Next Working Day + 1 Hour Delivery Window)

If your order total is over £40 then you can choose

  • Royal Mail Tracked - FREE
  • DPD Next Day -1/2 Price - Only £2.49

Please be aware that the prices above are for areas classed as "UK Mainland" by DPD which does NOT include offshore islands, Scottish highlands or Northern Ireland.

Non-UK Delivery

Our website has a comprehensive postage system which takes into account the weight of your delivery and the destination address - to get a quote for your order please add the products you'd like to buy to your basket, go to the basket page and fill in the "Estimate Shipping & Tax" section to get the price.

BFPO Addresses

This shipping method is available for British Forces Posted Overseas and addresses only. Shipping is as with all other UK mailing but please check to see that the size and weight of your order does not exceed maximums for your BFPO destination number by checking with the BFPO website.

Please note that once we have shipped the item and handed over to the BFPO service we have fulfilled our contract and delivery responsibility. All queries and problems with delivery must be taken up by yourself with BFPO and any claims must be handled between yourself and them.

Restricted Products

Please be aware that some products have restrictions on which countries we can send them to. Please enquire ahead of time if you require an order dispatched outside the EU and we can advise.

VAT Exempt

If this applies to you, the price you will pay for the goods will automatically be adjusted to remove the VAT element - you MUST choose the correct country on checkout for this to apply. We CANNOT refund the VAT once the order is completed.

You can also avoid paying VAT if you are having your goods sent to you in the UK, but are taking the goods abroad permanently within 3 months of making the purchase. You will have to pay the VAT with your order and reclaim the tax per relevant regulations - please be advised we cannot help with this process.


We stock the vast majority of products listed on our website in our Whitley Bay superstore and warehouse and these products are available for same day dispatch & next day delivery.

Due to the huge quantity of products we stock, we offer the ability to backorder products which have gone out of stock and less popular products which we don't carry stock of.

Depending on the brand these backorder products can take anywhere between 1 and 10 days to arrive into stock. We estimate 3-5 working days on average but please be aware that products from Mares and Scubapro are shipped from Italy & Germany respectively so can take a little longer.

As always if you aren't sure or want a more accurate estimate just give our team a call or email!


You can return any product that is in an UNOPENED, RE-SALEABLE condition within 30 days as long as it is not marked as clearance. Please contact us before doing this so we can confirm this ahead of time - we recommend using a recorded delivery service for any returns as you will be responsible for ensuring it reaches us.

Please get in touch to confirm a return by email or phone before sending anything back. When sending a return it is important that you include:

  • Your order number
  • Your name & a contact telephone number
  • The reason for return

We will try and get your return processed as quickly as possible but if you don't send this information it can delay the return.


If you have ordered something and it doesn't fit then we can exchange for a more suitable size, stock permitting, but you will have to pay the return postage.


Our customers have the right to cancel their orders within 14 days unless their order has been dispatched. After the order has been dispatched, it is the customers responsibility to return the item in a saleable condition and receieve either a full or partial refund.

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