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Automatic Vent Openers and Spares

Extremely reliable Automatic Vent Openers suitable for wooden or aluminium greenhouses and guaranteed for 2 years. Fitting neatly close to the glass the openers do not protrude into the greenhouse - so you don't bang you're head!

 

Bayliss MK 7 Vent Opener

Bayliss MK 7 Vent Opener

Suitable for use on nearly all greenhouses this Bayliss MK7 is an extremely reliable automatic vent opener operated by a stainless steel cylinder containing a mineral wax which expands with heat; this pushes a piston causing the vent to open. As the temperature falls the wax contracts and a strong stainless steel spring closes the opener.

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Cylinder for MK 7 / Triple Spring / Hydraulicheck

Cylinder for MK 7 / Triple Spring / Hydraulicheck

This easy to fit replacement cylinder is suitable for the Bayliss MK7, MK7 Triple Spring and Hydraulicheck.

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Bayliss MK 7 Hydraulicheck Vent Opener

Bayliss MK 7 Hydraulicheck Vent Opener

An extremely reliable automatic vent opener the Bayliss Hydraulicheck has a small hydraulic damper which causes the vent to open slowly but to close very quickly making the opener suitable for use on very light or conventional roof vents to stop any "twisting" and to prevent the vent from being wrenched open in high winds.

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Super Bayliss MK 7 Vent Opener

Super Bayliss MK 7 Vent Opener

This extremely reliable automatic vent opener Bayliss MK7 Super has been designed to lift very heavy double-glazed windows weighing up to 70 lbs. (32kg).

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Cylinder MK 7 Super Vent Opener

Cylinder MK 7 Super Vent Opener

An easy to fit replacement cylinder for the Bayliss MK7 Super Vent Opener.

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Triple Spring Bayliss MK 7 Vent Opener

Triple Spring Bayliss MK 7 Vent Opener

This Bayliss MK7 Triple Spring is an extremely reliable automatic vent opener designed to be fitted to top hinged side windows or light roof vents to hold them firmly in place in windy conditions, with its extra springs to exerting more closing force.

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Bayliss XL Vent Opener

Bayliss XL Vent Opener

This Bayliss XL is an extremely reliable automatic vent opener operated by a stainless steel cylinder containing a mineral wax which expands with heat; this pushes a piston causing the vent to open. As the temperature falls the wax contracts and a strong stainless steel spring closes the opener.

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Cylinder For XL Vent Opener

Cylinder For XL Vent Opener

This easy to fit replacement cylinder is suitable for the Bayliss XL vent openers manufactured since 2001.

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