All photos are © John Walmsley. All rights reserved. Moral rights asserted. | Connecting the electrical wiring citcuit to a 3 port valve for a central heating system. Apprentice engineering students at ...

Using a pillar drill. Apprentice engineering students at Kingston College. Kingston-upon-Thames.

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Connecting the electrical wiring citcuit to a 3 port valve for a central heating system. Apprentice engineering students at ...

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Apprentice engineering students at Kingston College. Kingston-upon-Thames.

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Connecting the electrical wiring citcuit to a 3 port valve for a central heating system. Apprentice engineering students at Kingston College. Kingston-upon-Thames.