Botanicare high quality PVC fittings for Ebb and Flow Systems. Feature interior threads which accept 3/4 in standard pipe thread. Use as ebb and flow fittings and bulkhead fittings. Increased versatility: thread PVC pipe fittings into bulkhead fittings - ideal for use in aeroponic and drip applications. Drains available with 1/2", 3/4" & 1" barbs, please choose appropriate barb fitting size for your tubing.