Davey Spa-Quip 40mm union O'ring.
O'ring is approximately 60mm in diameter and 4mm in thickness.
This O'ring is used on the pump and heater unions.
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Once submitted, your pool/spa details will be entered into our sizing calculator along with your local weather details provided by the “Bureau of Meteorology”. A personalise evaluation will be emailed to you within 1-2 business days by a Sensaheat product specialist.