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Michael Phelps MP Focus Snorkel Restrictor Cap

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Product Info

Michael Phelps MP Focus Snorkel Restrictor Cap Info

The Focus Restrictor cap is placed inside the barrel of the Focus Snorkel, restricting breathing by 40% to increase cardiovascular strength and build lung capacity.

Michael Phelps MP Focus Snorkel Restrictor Cap Features

  • Restricts breathing by 40% - creating a work-out for the lungs for improved capacity/fitness
  • Available in two sizes to eiyther fit either the Phelps Focus Centre Swim Training snorkel in Regular size or the Phelps Focus Centre Swim Training snorkel in Small size
  • Constructed of durable synthetic material

"In Stock"
This means that the item is in stock and ready for despatch. We do make the odd mistake but 98% of items that say in stock, are actually in stock. If you are ordering a quantity of any item, you are welcome to email or phone to check the quantity available.

"Despatch 6-10 Days"
You are able to buy/order the item but just to advise you that the item is not currently in our warehouse and therefore not available for immediate despatch but is on order or en route to us from the supplier and we hope to despatch your order within 6-10 Working Days, often less. If you want to know more details do just e-mail or phone us.

"Sold Out"
May mean the item is no longer available or possibly out of stock for some time. If you want to know more details just e-mail or phone us.


Free Standard UK Delivery on orders over £30 are usually sent by Royal Mail post (*exclusions apply see Delivery FAQs). FREE delivery, on orders over £30, applies to MOST, NOT ALL* UK mainland addresses (*exclusions apply see Delivery FAQs). We use a combination of Royal Mail and Carrier services and in some cases a signature is required to confirm receipt (high value/bulky orders).

For further detailed information please see Delivery FAQs.

We reserve the right to collate multiple orders into one delivery if going to the same address. We are unable to split orders/deliveries if any one item in an order is not available from stock, indicated by 'Despatch due date / Awaiting stock / Stock expected'. So we would usually despatch an order once complete as/when all the items are available from stock to send as one parcel.


We hope you are completely satisfied with your purchase but any unsuitable item may be returned to us within 28 Days of placing your order. 

Please email team@undersea.co.uk or phone us on 01736 751066 for a RETURNS AUTHORISATION NUMBER before sending the goods. Do please click here for all the details


The Phelps Swimming range is a development of the original MP range, created with the direct input of the former Olympic Gold Medallist champion, Michael Phelps and his long time coach, Bob Bowman. With their combined experience as elite swimmer and coach they have created an impressive range of quality swim wear and swim training accessories for both elite and leisure swimmers. The MP Xceed swimming goggles have become a favourite in top level competition with Phelps himself wearing them to win even more medals at his last Olympics. Many of the Phelps Swim Goggles have FINA approval and so can be worn at competitive level.  The range includes swim training aids including central front snorkels and swim hand paddles, a wide choice of swimming goggles and swimwear for men, women and children. The revitalised Phelps brand is sure will appeal to swimmers of all abilities at a recreational, leisure and general keep fit level through to elite performance swimmers.

Michael Phelps MP Focus Snorkel Restrictor Cap Reviews

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