Water Resistant Locker Lid Colour:Black (12009) The 3" unit has a

The 3" unit has a 3" BSP thread so measures 88mm on the outside of the diameter of the thread - you can put a ball valve on the end along with a conventional hose tail so you can attach a 2 1/2" internal diameter exhaust hose

Sizes Available:

XL - Outside Flange diameter 66mm

With the welded foil seal making it 100% water tight

It will rapidly remove rust stains

Water Resistant Locker Lid Colour:Black (12009) The 3" unit has aWater Resistant Locker Lid Heavy duty Body: Polycarbonate Seal: Nitrile Locking Ring: Acetal Seal: Nitrile transport cover with reliable watertight seal. Splash proof with an outside dia. of 235mm and an aperture of 180mm diameter Nitrile rubber seal. Hole size to be cut in tank is 190mm. Available in clear or black lid. Survey approved.