垫圈

垫圈	diàn juàn	to spread litter in a cowshed, pigsty etc
垫圈	diàn quān	washer (on bolt) / toilet seat
垫	diàn	pad / cushion / mat / to pad out / to fill a gap / to pay for sb / to advance (money)
圈	juān	to confine / to lock up / to pen in
圈	juàn	livestock enclosure; pen; fold; sty
圈	quān	circle; ring; loop (CL:个) / classifier for loops, orbits, laps of race etc / to surround; to circle