TM&W-Features – It is ideal for broilers, breeders, layers, pullets, ducks and game birds. Manufacturer recommends 3 birds per nipple does not require a drip cup.screw directly into PVC pipe or use reducing tees with Teflon tape for round PVC pipe. Delrin body, 360 degree side-action pin.working pressure should be reduced to under 1 psi.specifications screw size: 11/32 Inches pilot hole drill bit size: 5/16 Inches npt (national pipe thread taper): 1/8 Inches 360-degree stainless steel nipple weight: 8.5 g per assembled nipple. The colour is red. 10 pcs