A Knott guide tube with screw in grease nipples for Knott couplings with the model number KR20 with 45mm drawtube. 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. For more information please use our web chat TechTalk or call us on 01206 585439