We have received only one set of the O rings, as per the label attached on the parcel it contains
i.)	O’ ring EPDM 559270 208X3 2 nos.
ii.)	O’ ring EPDM- 50X3 4 nos. 
It seems that the O’ rings are of higher sizes & hence they do not fit into the respective grooves. Please ensure that the O rings ordered are on ‘Inner Diameter’ basis as specified by Technoforce and send new set of O’ rings as early as possible.
Also as per the Label O’ ring are of EPDM material, is it?