Armeg PTC water feed pump kit. Essential when drilling into porcelain to prevent overheating of the drill bits. Efficiently water-cooled Armeg diamond cores & carbide drill bits will demonstrate a more effective drilling action and will have a greatly extended service life. Water feed adaptor also required for large (13mm+) Armeg diamond cores. Armeg diamond drilling kits include the appropriate water feed adaptors. Armeg carbide drill bits don't require an adaptor. When attaching the water feed pipe to the adaptor, ensure that it 'clicks' into place for best results.