Included in the price of your Global Poly Water Tank is either a 1" or 1 1/2" valve outlet, a 75mm overflow, a mosquito proof mesh strainer and our written warranty. You or your plumber can decide where to place your fittings. See diagram. To compliment your Global Poly Water Tank the following items are also available: - Water Level Indicator Sight Tubes - The "Fathom Bob" Water Level Indicator - Cover lids in either the Dome Lid style or the flat Screw Fit Lid style - Overflow insect screens - Water Divertors "1st Flush System" - Pump covers. For an extra $150.00 we can also fit a fire fighting connection, outlet and valve to your tank. This allows the local fire brigade to connect straight into your tank.