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Alderdice Differential Heads

Alderdice Differential Heads are used between a tee piece and the top of a windmill. 

A Differential Head allows water to be pumped higher than the windmill and prevents water discharge from the top of the windmill column

Differential Heads

Alderdice Differential Heads are made in two sizes, 1 3/8" (35mm) internal diameter and 1 3/4" (44mm) internal diameter, the barrels are made from 3.3mm thick brass tubing.

The 1 3/8" I.D. Differential Head has a 1 1/4" B.S. Pipe thread cut on both ends of the barrel. The plunger has three leather cup buckets, the rod is 5/8" W. caps are available screwed 1 1/4" B.S.P. or 1 1/2" B.S.P.

The 1 3/4" I.D. Differential Head has a three leather cup bucket plunger, with 5/8" W. rod. It is fitted with one cap (single end) or two caps (double end), screwed 1 1/4" B.S.P. or 1 1/2" B.S.P. or 2" B.S.P.

Strokes: 8" (200mm) & 12" (300mm) - Longer to order.