909 3/4”-2”. Modification Overview. Production began in 1979 and is current. The 909M1 (1989) in the 11/4”-2” sizes only. Change was in the body only- internal components are the same. Check Cover Removal. Cover is o-ring sealed.
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* Simply unscrew the stem cap from the stem.
* Carefully guide and depress spring tension until the piston is completely into position.
* Insert screw driver up into vent opening to hold stem in place.