It is below the dignity of my page to put a plumber on it, yet i have endured occasions! A company where all of the gas engineers are gas safe registered. Can they provide you with local referrals? Trusted heating, air conditioning & plumbing service since . I have a cess pit, not septic tank can i use this ? Our gas safe engineers specialise in. I've used various drain unblocks in the past this is streets ahead of any.