A M14 shaped washer for Knott couplings with the model number KFG30. To check whether this part is suitable for your coupling, check the model number on the coupling. Our online catalogue lists all the Knott-Avonride coupling spares and the model numbers that each part fits. Fits KRV30A/B and KR30 couplings For more information please use our web chat TechTalk or call us on 01206 585439