Hollis OP Valve dumps are for replacing the over pressure valves on your Hollis Bladder.
Please note that if you have the Hollis SMS -system, you need to pick the Pull Dump valve for SMS from the dropdown menu.
30 DAY RETURNS
If you change your mind, it doesn’t fit, or you become inflicted with buyer’s regret - that's OK!
Mike's Dive Store offer an extended returns policy of 30 days - so you can be rest assured if the suit, piece of diving equipment or gift doesn't suit then just send it back and we will either exchange it or offer a full refund less any postage costs. Too easy!
For step-by-step instructions click here