Air & Water Pump Accessories Accessories for your Air and Water Pumps. Hailea 4" round ceramic air stone £5.00 2" Ceramic ball air stone £1.75 Air Pipe 4mm Per Metre £0.50 - £25.00 BUBBLEGEN V1 Twin Jet Bubble Generator £29.99 PLANT!T Water Timer (Battery Operated) £23.99 Plant It BigFloat Auto Top-Up Kit £21.00 4 Way Brass Air Divider With Taps £5.30