as long as it is not installed on a drain line. If it is used
strictly on the vent system then yes it can be used
horizonally.
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How many tee shirts will come in 1 kg
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yes
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You are allowed to tee the ball within two clubs lengths, behind
the tee markers.
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most long sweep tee's are called combination fittings which are
basically a wye and 45 made into one fitting. If your tee looks
like that combination it may be used. Plumbing codes vary from
state to state so it could be otherwise.