Open 7 days a week, 9am to 5pm Monday to Friday & 10am until 3pm weekends (Winter Hours and Bank Holidays vary) 

Summer offers - Get 10% off all Evolution Aqua products, use code GET10 at checkout.

4 mm Air Line Non Return Valves, these simply fit in line and prevent water from the system back siphoning back into the Air Pumps if the power fails or when maintaining the system and the power is switched off.

These simple 4 mm Air Line Non Return Valves (check valves) are very important if you cannot mount your air pump above the water level in your system. Remember accidents can and do happen, don't let it happen to you for the sake of a few pence, always have a few on hand as you never know when you may need them.

Fits all the 4 mm Silicon and clear Airline above.

We aim to dispatch orders received before midday Monday to Friday on the same day where possible. In most cases our items are available for 1 to 2 day delivery at a competitive price and are trackable via DPD or APC.

Delivery costs for standard items in the UK - £5.95

(Surcharges do apply to remote postcodes)

Heavy items - £9.95

Pipe - £14.95

Palletised items - Some large oversize products, typically items weighing more than 30kg, may require delivery via pallet. Standard Pallet charge is approx. £50.00. To ensure there are no delays with delivery, please include a contact number when placing the order.

Overseas – DHL and UPS, cost based on weight / volume at checkout.