McAlpine 19/23mm Tunvalve straight through, clear. A transparent tundish-style fitting that provides an air break in an overflow pipe — the clear body allows visual confirmation that the overflow is or isn't flowing. Used on unvented hot water cylinders and boilers.

Key Features

• McAlpine 19/23mm Tunvalve straight through — clear body
• Air break in overflow pipe
• Clear body — visual confirmation of overflow flow
• For unvented cylinders and boiler overflow pipes