Model MK81A is a special freeze-protected valve that drains water from Model 8300FP combination shower/eyewash after closing to prevent freezing. 1-1/4" NPT inlet. Standard sizes are 60" and 78" (152.4 and 198.1 cm) for bury depths of 24" and 42" (61 and 106.7 cm) respectively. Servicing Instructions: For replacement of damaged parts, order the VRKMK81A repair kit which includes packing, stuffing box, stuffing box nut, spring and plunger assembly with four O-ring.
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