Simcro rigid back-pack drench containers are molded in high-density polylene to with stand heavy -duty use, They stand on their base to fill, then used in an inverted position to gravity feed, a duckbill valve in the red outlet cap allowes air inlet, this cap has a dule spigot to suit 6.4mm or 9.5mm delivery tube [NOT supplied] Back-pack strap & cap supplied in the pack wall cavity.
